Any early symptoms?

Andie • 28 with baby #2 on the way
I don't see my mfm until the 16th and just went to my obgyn last week and she said the vaginal cramps are normal. But I keep having like almost a pinching or pulling cramp in my vagina along with Braxton hicks and I'm 18 weeks. Did anyone have any symptoms like this and found out they had a shortened cervix or am I just being paranoid?