I Hadn't Been Sexually Active In Over 2 Years But

i hadn't been sexually active in over 2 years but finally started having sex again in early october. well i had my period earlier then usual on the 23rd which lasted about 3 days. (normal is 1-2 for me) but i'm having certain symptoms. Breast tenderness, weight gain/loss, big appetite, a little nausea, lots of fatigue, belly continuously growing and i took 2 tests but they showed negative. Any ideas? My period this month isn't expected till thanksgiving weekend