High risk for premature labor

I'm only 15 weeks and already feeling way to much pressure and my stomach tightens a lot which are the same symptoms I had before I went into labor early with my son and my twin daughters . My body usually tries to go into active labor when I'm about 6 months :/ its been awhile since I've been pregnant so I forgot if I experienced this much pressure with my other pregnancies this early but I'm kinda worried because I just have a feeling I'm going to have another early baby .