I am on a number of medications... Zoloft, Lorzone, Percocet, duexis, Valium, and was on antibiotics for 10 days was taking 150mg 3 tablets 4xs a day and then a week after that was on a zpack... I did get my period in the beginning of the 10 day antibiotic but it was really light and only lasted 2 days.. Is this normal and can it be a side effect from all my medication?