Is It Normal To Get Bleeding Again After 1.5 Days From Periods?

Hi, My periods finished 2 days ago, I had sex today morning and got back my period for a day. I have always had this scenario for my periods, where my periods would last for 3 days, then a gap of about 1.5 days, and then again bleeding for about 3-4 hours after the gap, out of which, it would pain for at least .5 hours on this day. Is this normal? Or should I consult a Doctor? Thanks!