Last night I had a light pink color on my toilet paper. Well me and My boyfriend went to go have sex…

Last night I had a light pink color on my toilet paper. Well me and My boyfriend went to go have sex and like it hurt and gave me a sharp pain on my left side and then I started bleeding and so I put a pad on in case and had no blood on it until now and I peed a wiped and there was blood like if I was on my period but I've been off my period for about 4 days now. My period literally ended the 6th. And my lower back has been hurting like if I was on my period but again I just got off! Idk!