I was put in l&d at 19 weeks with my son to stop contractions. I'm worried it's going to happen again. I'm 17 weeks and have been having cramps today. This morning I was having what I thought to be sharp contractions but I also had a little gas so I was kind of confused. Now laying here in bed I'm having lower back cramps. I haven't been keeping up with them. I feel a little tightening in my lower belly near my pelvic bones. It kind of coincides with my cramps. Does it sound like something major or should I give it some time?