I've been religiously taking Lutera birth control for about 6, almost 7 months now. My periods are regular, and I've never missed a pill, nor taken it late. It's a week before my period is due, and I've noticed light brown discharge over the past few days which is unusual. No odor or other symptoms. My partner and I sometimes use condoms, but usually rely on the withdrawal method paired with the pill. Is there a possibility that I may be pregnant?