POSSIBLY PREGNANT & SCARED

Dec. 19 i had unprotected sex. Unsure whether or not he ejaculated within me is unknown & he even said he did not. 12 hours later i took a generic plan b pill named Take Action. Ive never used this before. Reading terrible reviews and how bad the side effects were i, since the 19th have been stressed senseless about being pregnant. i immediately have had sore breasts for two full weeks. I had intense bloating for the first week. the bloating completely stopped and my breasts are less sore but still sore. As of Dec 30 & Jan this being week 3 ive had a brownish bloody discharge that's thick. my period if on time, should be this week. Is this normal? Is the fact im having very accurate pregnancy symptoms normal?