It could be very bad Braxton Hicks. My doctor told me that if they occur then go away time it and if you start to feel it again within the next couple of minutes and this continues for the next ten minutes or so you might be going into labor
I have th's same problem but I'm now 33 weeks lost my mmucus plug and my baby has dropped Bern spotting and the nurses say it's normal
Go see yr dr.the same thing was happen to me at 20 week it's a good thing I went to the dr. Because my cervix started opening, had contractions and the dr could see my membrain.spent 2 weeks in the hospital.get a cerclage at 22 weeks.will be 29 weeks tomorrow