What do you think

So a bit of a back story while I was pregnant starting in my second trimester I had no desire of sex at all i felt bad for my husband but just thinking about it just made me not want it even more anyway after I had my son and my 6 weeks recovery went by my sex drive came back again but now when I try something or text him during the day and tell him I wanna have sex that night he always has some type of excuse he’s tired not in the mood or he wants to wait until later ect... idk what to do but I practically feel like I have to beg him to have sex idk wat to do or say it just never use to be this way I love him and our son but going weeks with out is so hard what should I do? Think? Or say?