History of preterm labor--

So a little backstory, I went into preterm labor 2 times with my daughter. At 30 weeks and 34 weeks. Had her the day I turned 37 weeks because my water broke. I was 2 cm dilated at 25 weeks. She wasn't even over 5 pounds and I almost couldn't take her home with me. I'm at a new OB with this baby and I'm now 31 almost 32 weeks pregnant and they still haven't ever checked me?? I've even asked for them to check and they won't. And even on an ultrasound at 20 weeks they said my placenta was only a centimeter from my cervix. WHY ARE THEY NOT CONCERNED??! I've even told the OB that I've had pretty decent contractions and they just don't seem concerned at all?? Am I overreacting?