Hi, I Am 15 Years Old. I Had Unprotected Sex

Hi, I am 15 years old. I had unprotected sex 3 weeks ago but he did not even come close to ejaculating in me. I had sex again in a similar situation 2 days before my period. I began bleeding directly afterwards but it was very light, I've been having a brownish spotting for 7 days now. I've been vegan for 7 months and have always had a regular period. Am I pregnant?