Had unprotected sex on 16 August - condom slipped off - and got period on 7 September
Took Norlevo - morning after pill - on 17 August (Day after sex)
Did home pregnancy test - clearblue - on 3 September and came out as negative.
Was that too soon to do it?
If I took Norlevo the day after, what are the chances that I'm pregnant?
My period is extremely heavy!
It's been irregular lately so don't know if it was late or early or on time.
Please help!

If you got your period, you are most likely not pregnant. The first symptom of pregnancy is a missed period.

You will have to wait until next month to see if your period comes. If not, you will have to test two weeks after you expect it for an accurate result.