Braxton hicks?

I'm 18 weeks tomorrow, and started having Braxton hicks yesterday. They were accompanied by a sharp stabbing pain at my cervix, but today no pain just a sore stomach. This is baby #3 and my first two were smooth, no complications. This one has been nothing but! Based off of my early screenings I was told I am a higher risk for preeclampsia, preterm labor and gestational diabetes. Is anyone else experiencing Braxton hicks already? I'll be discussing with my doctor tomorrow but just wanted to see if I'm not alone.