Help??

Emma • 19 year old first time mom. 26 weeks ago. Suffering with emetophobia!
I'm 36 weeks and 1 day today and I'm a first time mom.. Today and yesterday I've been experiencing contractions and a pinching feeling in my vagina (tmi) and I'm just wondering if anyone knows why I'm experiencing this pinching feeling... It's pretty painful and it comes and goes. Sometime it lasts a while though...