Took the morning after pill last month and had my period 28/10 -3/11 . I bleed for 7 days,it was lighter than usual but now I'm late

Yes, you are late because of taking the morning after pill. This can actually change your periods.

However, there is no method of birth control that is 100% effective, not even the morning after pill.

To ease your mind, try taking a HPT using first morning urine. If the HPT is negative, wait a week to see if your period comes. If not, take another HPT and schedule an appointment with your doctor if that one is negative as well.