Might i be pregnant?

Patient: All my pregnancy tests are negative, i am on birthcontrol, but my breasts are very tender and i can’t slep at night due to a stuffy nose, i also gained more than 10kg while on nur-isterate, and switched to the pill about 2 weeks ago, and haven’t had my period yet.can i be pregnant?or is this normal for switching birth control methods?paranoid, please help.