Implantation or early period?

Meg • I'm Megan! I am a dancer if 10 years. Very good with people and advice.

On the 14 of June I had unprotected sex, and he has finished the job inside. I had started my birth control a week and 3 days before this had happened. I took a plan b after. I am having weird bleeding. It’s a light red/pink and I still have 5 days until my period. I took a test and it came back negative. Is it an early period? I don’t have any symptoms. My boobs aren’t sore or anything.