Sex while pregnant

Since I found out I was pregnant, boyfriend has wanted sex multiple times a day. I don't mind because I have a high sex drive myself! But it seems a lot tighter? And I don't get as wet. Which causes me pain. No matter how much fore play he does, I just don't seem to get very wet. Boyfriend asked if it's him. It's not! It's me :( in super turned on!  Is this hormones? I know I need to invest in some lube, but not sure how boyfriend is going to react because he seems to blaming himself :(