Hi. I had sex(was protected sex) last Friday early morning and I found out that I was having two drops of blood after having sex but during the day I was fine and didn't found any bloods drop. The day after(Saturday)morning,I found blood on my panties which seem like I was having period for the first day(wasn't a lot of blood) but later on I found out at the afternoon I was fine and there were just a little blood. The spotting blood that only we notice when I wipe my down there or a few drop on my panties continue until today which is now(Monday).I had a pregnant test yesterday(Tuesday)evening and it come out to be negative. I suppose to have my period around this time tho. What does this mean? please help,thanks.