whitish discharge could also indicate a yeast infection would could delay your period. However, it could also be an early sign of pregnancy. If I were in your position I wuold wait one more week and take another test with first morning urine. If it is still negative and your period has not shown, contact your ob.
I was also recently just taken off of a series of antio-biotics, I was on a z-pak for 5 days, then amoxicilin, then Levaquin and Prethesdone, and I had an allergic reaction to Levaquin and was given more prethesdone to counteract the allergic reaction. Could these medicines be messing with my cycle, even though I'm on BC?
Yes they can. Antibiotics can reduce the effectiveness of Birth control pills and in doing so could screw up your cycle.