I'm 34 weeks, with significant medical issues, and haven't had sex with my DH since we found out I was expecting.
Sickness, then the spd kicked in once the sickness wore off at about ten weeks.
DH hasn't mentioned it, and doesn't even touch me unless I ask as my skin feels so sore and I feel so touched out all the time.
But, even if I didn't have spd, it's my body, and if I said no he would never ever get mad with me.
I think your DH is in for a shock post birth when you might not want it for a year. Stitches, tiredness, breast feeding...
There might well be no medical reason, but since when did you need a medical reason to say no to sex? Prior to being pregnant I said no because I was too full, too drunk, feeling bloated, mad because he wouldn't let me feed the street children in a dream, in clean sheets and didn't want to mess them up... all valid reasons because I didn't want to. He has also not wanted to because he was stressed about the car, bloated, had a headache, wanted to go to the gym... the list goes on. It's your choice, your body, and he needs to respect that. He should also be apologising profusely now. What a tool.