Probably from the extra blood flow making you sore then...doesn't matter wet or dry that will still make you more sensitive
I'm not dry at all thats the thing my hormones are crazier than before but it still hurt
Your probably just extra sensitive down there. Pregnancy can do that because you have so much extra blood flow. Try a little lube to make things more comfortable. I recommend PINK because its hypoallergenic.
You might be a little dry down there? I have been and when I use lube I feel a lot better. Just use the regular unscented and non flavor kind.