Not having sex often

I will be one year married next month but together 3 years, I got pregnant so I move in with my now husband so I was more worried about the pregnancy that I really never realized that our sex life wasn’t happening as often but once I had my baby girl and time pass by I started noticing that he was not even interested in having sex some times only once a month or some times twice, and like 2 time I try to approach him but he just push me away so ever since then I don’t approach him and the random times that he do, he would just finish in probably 10 min or less and that’s it, when he be drinking he has try to parochial me but I just don’t want to because I feel like is just when he want but not when I have wanted and we argue and nothing happened. I just wonder why? Am I the only one having this problem? I don’t know what to do or what to think?