Light pink bleeding after sex

Just about 34 weeks. We had very gentle sex tonight because I found it very uncomfortable for the first time this pregnancy. I *know* spotting can be normal after sex but I’ve literally never had this happen before so I’m a little concerned. My last baby was a 35 weeker and I’d rather not have another preemie. I am having contractions also, every 5-10 minutes, but that’s not unusual for me. I was actually in a few days ago having contractions monitored and they told me as long as they didn’t build in intensity and I didn’t have any other signs of labor, that it wasn’t an issue to be contracting so frequently.

At what point do I worry?

Ty in advance!