Almost pregnant? Or period?

Sex 2 weeks ago. Period isnt due until next week. Today im bleeding. Its not heavy on pad its pink. When i wipe its red or a really really dark pink. Hoping its not my period. With this, my breast have veins, lower back is hurting and also upper abdomen/ front ribs pain. (The feeling when you press on a bruise) nausea. Headaches looots of fatigue. Cramps also. Is this implantation symptoms or just me getting my period.