Anyone had this problem before....

Melissa • Fri, Jun 05

I took a cheapie pregnancy test and there was a faint positive and then I took a walmart one and it was also faint positive. (One was at 7:30am and the walmart was 8:30am yesterday)

I took a clear blue digital this morning and a cheapie and they both were negative! Any clue what is going on? Have you experienced this before? My period starts on 6/9 and I had positive opk on May 19th (2 days after my period) and another on May 30th.