Llevo leídas dos novelas en español este mes.

This is a very common Spanish pattern:

llevar + past participle + quantity/object

It expresses how much someone has done so far, often with a sense of accumulated progress up to now.

So Llevo leídas dos novelas en español este mes means something like:

I’ve read two novels in Spanish so far this month.

The idea is not just that the reading happened, but that your current total is two.

A similar pattern is:

Llevo escritas diez páginas = I’ve written ten pages so far
Llevamos vistos tres capítulos = We’ve watched three episodes so far

Because leídas agrees with dos novelas, which is feminine plural.

• novela = feminine singular
• novelas = feminine plural
• so the participle becomes leídas

Compare:

• Llevo leído un libro or more commonly Llevo leído / leídos... depending on structure and region, but in standard agreement-based use:
• Llevo leído un libro is less parallel than:
• Llevo leído? Better clear examples:
• Llevo leído un libro is heard, but the clearest standard agreement examples are:
• Llevo leído un libro / Llevo leídos dos libros
• Llevo escrita una carta
• Llevo escritas tres cartas

In your sentence, since the thing read is two novels, Spanish uses leídas.

Because this is a different construction.

With haber + past participle, the participle does not change:

• He leído un libro
• He leído dos novelas
• He leído una carta

The participle stays leído.

But with llevar + past participle, the participle often behaves more like an adjective describing the object as completed, so it agrees with that object:

• Llevo leído un libro
• Llevo leídas dos novelas
• Llevo escrita una carta

So the agreement in leídas is one of the clues that this is not the normal perfect tense.

Both are possible, but they are not exactly the same in emphasis.

He leído dos novelas en español este mes
= a straightforward statement of fact: I’ve read two novels in Spanish this month.

Llevo leídas dos novelas en español este mes
= emphasizes the running total so far, as if you are keeping count.

It often suggests:

• the month is still in progress
• the number may increase
• the focus is on progress/result up to this point

So llevo leídas feels a bit more like:

I’m up to two novels read this month.

No, not literally.

Although llevar often means to carry, to take, or to wear, it also has a broader meaning in Spanish: to have accumulated, to be up to, or to have done so far.

For example:

• Llevo tres cafés hoy = I’ve had three coffees today
• Llevamos gastados 200 euros = We’ve spent 200 euros so far
• Lleva hechas dos tareas = She has done two assignments so far

So in your sentence, llevo is about progress/accounting, not carrying anything.

Because en español refers to the language.

So:

• novelas en español = novels in Spanish
• novelas españolas = Spanish novels, meaning novels from Spain or Spanish literature, depending on context

Your sentence means you have read two novels using Spanish as the language of the text. They might be:

• originally written in Spanish, or
• translations into Spanish

If you wanted to say the novels were specifically Spanish works, you would normally say novelas españolas.

Este mes means this month, and it places the action inside a current, unfinished time period.

That matters because the sentence is counting a total up to now:

• not last month
• not at some undefined time in life
• but during the current month

So the full feeling is:

So far this month, I’ve read two novels in Spanish.

This matches the progress idea of llevo leídas very well.

Yes, that is also possible.

Both of these are understandable and natural:

• Llevo leídas dos novelas en español este mes
• Llevo dos novelas leídas en español este mes

The difference is mostly one of focus and style, not basic meaning.

Very roughly:

• Llevo leídas dos novelas puts early emphasis on the idea of already read / completed
• Llevo dos novelas leídas puts early emphasis on the number of novels

In everyday use, Spanish allows both patterns. Learners will often hear both.

Because the past participle of leer is leído, and the accent shows that the vowels are pronounced in separate syllables:

le-í-do

Without the accent, Spanish spelling rules would tend to make it look like a different pronunciation.

In your sentence, that participle changes to feminine plural:

• leído
• leída
• leídos
• leídas

The accent stays in all those forms.

Yes. It is a very useful pattern, especially when talking about completed amounts so far.

Examples:

• Llevo escritas veinte páginas = I’ve written twenty pages so far
• Lleva hechas dos llamadas = She has made two calls so far
• Llevamos vistos cinco capítulos = We’ve watched five episodes so far
• Llevo aprendidas muchas palabras = I’ve learned many words so far

It is especially common when there is:

• a countable result
• a sense of progress
• and often a time frame such as hoy, esta semana, este mes, etc.

Yes, it sounds natural in Spain.

In Spain, speakers very often use forms that highlight current relevance and progress within a still-open time period, and this sentence fits that perfectly.

A speaker in Spain might say either:

• He leído dos novelas en español este mes
• Llevo leídas dos novelas en español este mes

The second one is especially good when the speaker wants to stress how far they’ve got rather than just report a fact.