I am 19 yrs old. I used to have irregular cycle but since September last year till February this year, I had my periods regularly every month. Anyway, my period was 9 days late. I feel so tired, sometimes nausea recently and I have these symptoms everyday. Last night I had sexual intercourse with my boyfriend. This morning, my vagina bled. The blood is bright red. Its still bleeding and now I feel cramping at my lower abdomen and I have lower back pain. I have no idea whether this is period or not. Something wrong with me. Should I go to doctor and get it checked? I'm so worried atm. PLEASE HEPL ME!!!