Taking a break before H1approval

I am here on a L2-EAD and working for about a year now as a contractor. My employer applied for a H1B 2 months ago. I am planning to take a break for 4 months since I am pregnant and due in 2 months. My question here is, can i take a break before my H1B gets approved? Is it okay to do so or will that interfere with my H1 approval. Also, how do i convey this to my employer?

Appreciate your advice