I really think that if you're a bit anxious about it and DH is not that bothered, I'd leave it and do other things to get off.
In my first pregnancy we shagged like bunnies all the way through. I was so horny, we were newly weds....
I had an mc, and in the first trimester this time we didn't do it at all as I was really worried. Obviously there was no need to be, but the bleeding with my mmc started after shagging, even though the baby had died weeks before. Anyway, we were both happier not to do it.
Second trimester we did it a few times, but I had bleeding at about 26 weeks so left it several weeks until trying it again.
Now in the third trimester (35 weeks) we are both very keen, but I'm finding that my clitoris is very sensitive and is sore after, its hard to get the angle right (i'm one of these weirdos that only really comes in missionary position), and I get quite sore contractions for about an hour after. Generally making it not much fun. I'll probably have an ELCS in 2 weeks, then I think you are meant to abstain from penetration for 6 weeks. Last time I was pretty horny again from day 1 though!
I do give DH hand jobs in between, actually he says that when I'm pregnant I get too wet 
and things feel a bit different so I tend to finish him off that way anyway. Fortunately it has always been me with the higher sex drive, I've rarely said no to him, so he's happy. I always want to, but the soreness and contractions after just are not worth it at the moment.