MIA sex Drive

Ever since I got pregnant with my first child my sex drive has been MIA. I’m not sure what’s going on with me. I used to have sex all the time. My BF has become less attractive to me as he let go and gained baby weight with me. It sounds horrible when I reread what I am writing but non the less it’s the truth. My son is 4 Months old and I have had sex 2-3 times since I have gotten pregnant. I don’t even have the desire for it. I feel unattractive within myself. I’m depressed about it. I am writing this wondering if I am alone?