hi, i am on the implant but i had tender breats this has went away now, i have gained 2 - 4 pounds in the last month and this doesnt usually happen to me, i am gettin headaches but i do have exams at the moment, i havent had a period yet but they are never accurate due to the implant, i have no other symptoms, i had sex on the 12th of feb, could i be pregnant