I'm liz and a few days ago I started spotting a brownish discharge. It lasted for two days and now when ever I wipe a pinkish or brown discharge on the tissue. I've never had spotting before. But recently I have gotten mild head aches and slight nausea. I've had unprotected sex numerous times this month using the pull out method. I know it doesn't work but its too late to realize that now so. I'm supposed to get my period in a week which apparently is when you get implantation bleeding. Is this true. Do you think I am pregnant?