He has no sex drive!

I have been married about 6 months and we got pregnant about 2 months ago. I love everything about my new husband! He is so perfect for me and my one year old. Except.. he has such a low sex drive! I don’t understand it, he is super fit, super sexy.. and the first couple weeks were great. Now I feel like I am practically begging him and it’s gone down to once a week or once every two weeks. When I bring it up he just acts like I am complaining. It is driving me crazy! I have more exciting dreams than I do a reality in regards to the bedroom.. 😞