... 10 days late...

Huh... So I'm 10 days late, and I had some (sorry tmi, sorry) pink/light red when I wiped this morning. Nothing since then. No sign of my period. I'm on birth control, so I'm not thinking I'm pregnant, but I'm worried that somethings wrong. Any ideas? I'm not dealing with stress, not under/over weight, not excessively exercising.