I've been taking birth control for about seven months. Never missed a period. I take velivet. I just moved into a new place and started eating healthier. I recently had a sinus infection and was on an antibiotic until the second sugar pill. I always use a condom when having intercourse. I have all the period symptoms I normally get but no period. I have one sugar pill left. Does any one experience this? Is it normal? Chance of pregnancy?