Becca is right… antibiotics and birth control are not a good combination. And there is always a chance that you can fall pregnant when having unprotected or even protected sex. THere can be any number of reasons to explain the symptoms, stress, a change in your diet and even excercising more than usual can make drastic changes in a woman’s cycle.
Just try and relax do the infamous two week wait and take an hpt if your period is late this month.
Wishing you all the best,
Eva