Early evening of monday oct. 25th I started what I thought was my period( 9 days after I had unprotected sex, 3 days b4 my period was supposed to be due). But *sighs* I only spotted( brown blood) once I was also cramping bad too, then it stopped until the next morning & again I spotted(brown blood) only once and then totally stopped. I havent spotted since . Friday morning I discharged dark brown mucous . Tonight my pelvic area is very uncomfortable, have annoying back pain & I am cramping

.....My left breast has been hurting since monday and now....Both breasts hurt

if this was my so called "period" is it normal to just totally stop like that?Could it have been implantation bleeding?

Any suggestions?!