Help please - blood everywhere

So 9 days ago, on Saturday, I had unprotected sex. That was one day before my “fertile window” started. On Monday, like 35 hours after sex I took a pill, an “after pill”. I don’t use any other preservative methods, like the normal pills or any of that stuff.

The week passed normally, but last Saturday, exactly one week after sex, like at 1pm I started bleeding, like if I had my period, but my period is expected to come in 11 days.

Since Saturday I’ve been having this heavy flow, now I’ve have it for three days.

My period is “supposed” to be coming in 11 days.

Do you have passed through something like this before?

Is this an adverse effect of the pill and I have to chill out?

Will my period come when expected, in 11 days?

Any help that you can give please, I will appreciate it so much.