Need your advce

Well I dont know what is going, on, The last time I finished sex with my boyfriend, when I went home I noticed that there was some spot of blood on my pant and then tommorow I started my period but I wasnt suppose to start my period that earlier, and then I only go for 4 days which I was suppose to go for 6 days, and then when I finished within 4 days I started my period again, so im juss wondering what is going on with mie.

because I have never experience this problem,

sex can cause you to start your period earlier. this has happend to me but in your case where you got it twice your boyfriend could have torn something in you or cut you some how up there. that can cause you to bleed which makes it not your period. if the sex is a little rough it can make you bleed.

did you take the morning after pill after you had sex that time as well? becos that can mess up your system.

if this was your first tiem haveing sex its normal but if its not you might want to consult your doctor or perhaps your body is just changing