What could be this possibly?

[MissPhil]

I had my last period, last september 21-25 2011, heavy period. as usual, and i have regular period. It happens in every line of 2 in the calendar. i have never had sex since january, then when my boyfriend arrived, we had sex in the october 2nd, 5th, 7th, and without any signs of impending period. in the morning of 9th of october, i had this light period like bleeding, and i expect my period to have it on the next 20th something of october. and normally on my period, first day would be my heaviest day of bleeding, i can soak up to 2-3 pads. but this unusual thing is this frst day, is very light. still we continued having sex in the 11th of october, the characteristic of this period like bleeding is lighter than usual, it lasted for 3 days. i have cramping usually during my period. but i ddnt feel it this time. and now. after the so called period is gone. i'm now feeling sick.actually i'm sick. really, like i feel my body temps above the normal, colds, and cough. ugh! i'm very confused. is it a period? or decidual bleeding? somebody please answer

[MissPhil]

yes unprotected sex. and lately i'm feeling sick. and headache. idk really maybe its psychological.

[Lesley27]

PS ovulation usually occurs about 14 days before your next period so counting back from the 20th puts you at about the 6th... so thats what i ment....

[Lesley27]

were you having unprotected sex? im wondering if the light bleeding on the 9th may have been implantation bleeding... as it looks like you were ovulating around that time and implantation takes a few days... you could try to take a preg test now... (one that tests early) with your first pee in the AM... if its negative wait till your period is late after the 20th (or you could jsut wait till its late-but it might show now)