Hi, im a teenager and I had sex 4months ago using the withdrawal method. I took a pregnancy test and it was negitive. My periods used to be 7 full days and heavy but 3 months ago it became lighter and only lasted for 3-4 days. Well i took a pregnancy test and it was negitive. I took it at 1pm. Well i have alot of symptoms like back pain, migraines ebery two hours, dizziness, irritability,unusual food cravings, nausea, my boons are tender and grew alot, my ankles swell up, my clothes are to tight, i gainned 15pounds Im out of breathe easy.