I had a procted sex with my boyfriend on 7th may 2017 .next i started bleeding.. the colur of the blood is dark red and flow is quite similar to my periods ..i m having 28 days of menstruation cycle according to that my period is suppose to come on 20th may..but this 12 days early...i m.confused that is it implantation bleeding or periods...? And should i take pregnancy taste now ..or should i wait for some days ....i m really scared ..please advice