"Labor pains" after intercourse??

Jade • TTC since April 2015 for baby #2, have a 5yo girl, have been with hubby for almost 8yrs, hoping to be blessed again :)
My SO and I had sex and now I feel like I did when I was in the early stages of labor with my first pregnancy... Has anyone else felt like this?? I'm only 30w3d so it's still wayyyy too early to have the baby! Help! 😬