Please help..

So last week, I took one of those 88 cent pregnancy tests from Walmart and it came back with the FAINTEST line in the world. But it was still visible to the naked eye. After taking that, I decided to take two more just to be sure. One being another 88 cent one and one being a clearblue +/-. Both came back negative. I took the 2nd clearblue test early this morning which came back with yet again, another faint positive line.

TMI time; my period was supposed to arrive June 18th. I started light bleeding on the 8th or 9th. It got a little heavier the next two days and then the fifth day, I stopped bleeding all together. Not a drop of blood. I even used 3 regular tampons just to be on the safe side, and none had blood on them. Basically my "period" was a total of 4 days. My normal periods last between 7&9 days and they've been regular for the past 7 months.

I also noticed this morning that my nipples are EXTREMELY sensitive to the point it hurts to wear a bra or even slightly brush across them.

My question here is, should I think about making a doctors appointment with a baby doctor, or should I wait a couple weeks and take another test?