Am i having my period four days early or is it implantation bleeding? i'm 11 days past ovulation and this has never happened before

Can't tell yet: Wait. A positive pregnancy test can tell a woman that prior spotting was actually implantation spotting. It is hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result about 3 weeks after sex (3 weeks after when conception might have been) or 1 week after starting a "weird" period.