Sex issue HELP !!

Reina • Im 19 Turning 20 August 6 , i am Pregnant and Happily with My SO trying to have a happy life with our soon bundle of joy
Okay Ladies , me and my husband had sex today but my abdominal area was hurting when we was doing doggy style and when i was on top i felt like he was pushing something back , i dont feel like this usually any ideas or advice ?