Gagging during oral

So during my first trimester my boyfriend and I were having sex, I’m pregnant and get very winded very easily so I decided to take a breather...got some water and decided I’d give him a bj cause I’m tired at this point. Prior to this I hadn’t ever gagged this bad while giving oral ever, it was always one or twice, and after finding out I was pregnant I didn’t even bother because I was afraid of this happening. So I go in and I immediately start gagging and I’m like okay let me try again, mind you I’m not even going deep and it’s just like automatic. I’m like sorry babe give me a minute, I get myself together and I try again and at this point he’s like just go to the bathroom and I’m just like but I don’t actually have to throw up. So I felt really bad because I’m all for pleasing my man especially since he pleases me, we haven’t talked about it since then. But the sex has still been great and he still give me oral. I want to try again, now that I’m further along and am a complete hot dog. I just hope the gag reflexes have settled at this point. It was never like this before pregnancy. Anyone have any tips??