What Causes Bleeding After A Week Of Taking Unwanted 72?

i n my boyfrnd tried having intercourse for the first time.
he put condom n started but in the middle the condom came out and our parts came in direct contact..but his penis didnt went inside infact my hymen is not yet broken.
he stoped imidiatly after this.
i ate unwanted72 contaceptive pill within 2hrs of this act.
this hapend on 20th jan.
on 26th jan i got my periods which last for 4 days but the flow was very low..
i last had my period on 14th jan.
i m confused that wat happn on 26th was my periods or the spotting which happens during pregnency.
plz tell me if i m pregnent.