What Could Delayed Periods And Light Cramping Indicate?

Hi there. I ve been taking Alysena 21 day birth control off and on for years now. I started again in January, and since then I ve had some irregular bleeding the week before my scheduled period. I know that s normal for the first 3 months or so, however I finished my pack for this month on Thursday April 3 (I also just finished the early bleeding that day) and was expecting my period around the 6 however it didn t come. I took 3 extra pills that final week..1 to stop the bleeding and 2 more because I had unprotected sex on April 4. I ve had a very mild pain in the left side of my abdomen since about Thursday April 10. Originally it felt like a mixture of cramps but now it s just that light pain. It s not as bad as last week but it s still lingering. Not sure if it could be caused by the extra pills taken or if I should be concerned about pregnancy, though I know it would be rather soon..