I just started birth control about a month ago and I am not sure how long the side effects are supposed to last. However I was on birth control before and I didn't have these side effects as long as I've had them recently. It's the same pill so it's not my body adjusting to a new type of birth control. My symptoms consist of my breasts hurting for about a month and a half ; feeling sick to my stomach when I eat or brush my teeth sometimes; getting tired alot earlier and waking up earlier each day; getting headaches close to the end of the day and lower back pain at times. I also will get lightheaded sometimes but not alot. All these symptoms have been going on for about a month and a half and I am afraid I am pregnant. Could someone help me!!!