Hi, I Had Protected Sex 5 Days Before My Period

Hi,
I had protected sex 5 days before my period (used condom) but I was scared and took I pill 3 days before my period. Now my period is delayed by 3 days and I get tiny blood stains and dark brown discharge followed by cramps and other signs of periods butmy regular period is not starting.
Could it be a sign that I'm pregnant?
Please help!