Discomfort during sex?!?!

Anyone else start having some discomfort/slight pain during sex during second trimester?? It only happens to me when I'm on top. It's like his penis is going too deep all of the sudden and causes me to feel discomfort. I had tried to resituate myself differently and at first that resolved the issue but not anymore. I never had this issue in my past pregnancies. And it's only when I'm on top which we have been experimenting with other positions because of that. Just wondering if anyone else has experienced this and if it went away or was like that consistently. I figure it's the weight of baby growing and maybe position of baby that is causing my issue.