My boyfriend and I still use condoms even though I am on the pill, but about two weeks ago we had sex without a condom. I took Plan B the next day and still kept taking Lutera regularly. We kept having sex with a condom since and I took a pregnancy test yesterday that came out negative just to be sure that the sex without a condom didn't cause a pregnancy. The only reason I am still concerned is because I have never spotted before and the last three days I have been having brown discharge lightly and today it turned bright red as if its just blood now, not discharge. My calendar says my period should come in three days... I should not be concerned that this is implantation bleeding right?