Hi there I had my period on the 8th February 2016 and finished on the 11th this is normal for me. I had unprotected sex with my husband on the 13th February my circle is normal 24 day so I think I should have come on the 3rd March 2016 but didn't I had a bit of blood on the 6th March it was very light it was on and of and I stop buy 8th morning please help as iv done 3 test all negative