Please answer. Urgent.?

I have no idea how old you are. I do know that younger women are more common to have irregular periods. If I were you, I would take another pregnancy test to be sure. If you test too early it may come up negative when you are pregnant. It is possible to bleed while pregnant aside from implantation bleeding. If you are 100% sure you are not pregnant you should consider seeing and obgyn especially if you had unprotected sex.