How to make sex comfortable

Jessie • Stay at home Mom to a wonderful daughter. Married to my best friend. After 4 years TTC 4 rounds of IVF proud twin boy mama. Loving life each day as it comes.

How do you ladies get comfortable while having sex? Laying on my back hurts and it uncomfortable in like doggy position. My belly rocks back and fourth ? I don't wanna deprive my husband for the next 4 months however I have had to stop it the past two times just from being so uncomfortable