30 weeks Dropped

I will be 30 weeks tomorrow and I dropped for sure yesterday. Don’t get me wrong it’s nice to feel like I can move better, breathe better, eat better and less acid reflux. However I just had a baby 16 months ago and it was a c section. I am worried about preterm labor. Anyone drop early and go into preterm labor. I get a lot of BH contractions and have since like 20 weeks but sometimes they get painful. I sometimes get lower back pain that feels like a period. I also get twinges all day. Idk I know I’m not in labor right now but I’m just curious if anyone else has experienced this.