cramping during sex (might be TMI? sorry if it is)

So not sure where to post this, but since I became pregnant sex is so painful! Every time he goes in deep it feels like someone's stabbing my lower stomach. I'm 13 weeks today, and we tried it tonight and had to stop because it hurt so bad and he noticed that I grabbed my stomach. I feel so bad, I want to be able to make him feel good, it just hurts! And I know cramping after orgasm is normal, but is this? Thanks for any input/advice.