I had unprotected sex with my boyfriend of a year and a half on septmeber 12th I was due to ovulate on the 14th well I haven't been feeling all that great. My period was due on the 28th, I am regular and I started on the 24th but it only lasted 2 days. The first day wasn't as heavy as I usually am and the second day I was pretty heavy but not like I usually am then all of a sudden I quit bleedding and when I would wipe it would just be a pinkish color could this be implantation bleeding? Or something else.