My last period was within the first week of September ....so I was due sometime within the first week of October. No period. I've taken 3 pregency tests within the past three weeks....all negative. Where is my period?! I'm starting to get concerned something is wrong. Also within the past month I had a huge birth control mix up and ended up missing about 7 pills. Could my cycle be messed up bc of that? How long do you think I should wait before I go to the doctor? During the past three weeks with my missing period, I've been extremely crampy, having heart burn and other digestive system problems & some pain during sex. (Like massive cramps) any advice is appreciated. Today marks the official three weeks late mark, however my breasts started to become sore....like they do before I get my period...so I'm hoping it will come. I'm still currently taking birth control and according to the pack I would be due for a period next week. What could of caused me to miss a month? The birth control mix up?