Implantation Bleeding or Period?!

My boyfriend and I recently decided we wanted to try for a baby. So, we tried three days in a row, multiple times. He didn't pull out at all. Now, I'm sitting here almost two weeks later, I missed my period by two days and on Sunday, my discharge was brown. As the week progressed, it turned brown to red to light red to a pinkish color. Its very light so I don't think its my period. But I dont want to be wrong. I've worn a pad all week so I could monitor it. Not once has it gotten heavy. It's been about 4 days and it still hasn't stopped but it seems to be. Someone, please help me!