Light spotting 38 weeks

This morning I went to the bathroom and had some light red (close to pink probably) blood. I wiped maybe like 3 times then it was basically gone. It wasn’t really mixed with discharge or anything. I would call my doc and ask about it but it’s Saturday and the office is closed.

I did have sex yesterday like midday. I didn’t bleed after that but maybe this is from that?

Got checked on Thursday and I’m 4cm dilated. I do bleed after cervical checks and pretty sure I did, but this is a few days later.

I’m not too concerned because I still feel baby moving, but want some other opinions? M