Strangely Short Period with Dark Red/Brown Blood

Hello everyone!

Am in quite a stressful situation, as my period is acting incredibly abnormal. I took birth control a week before my period since after possibly getting some cum on my fingers after giving a hand job to my partner, wiping it off on a paper towel, and putting my hands down near my pelvis area, I had no firm idea as to whether or not anything slipped in to my vagina on accident.

My period started one day early with heavy brown and dark red discharge followed by a fulk day of heavy, normal-red blood flow and clots that felt just like normal, minus zero cramping, breast tenderness, nausea, nothing, and then on the third day it has been nothing but very light brown discharge with red mixed in until now where there is essentially nothing.

Have yet to test, because I am still uncertain if that is necessary or not, but am still stressed nonetheless. Would any and all advice on the matter, or any idea as to whethet or not these are signs of an early pregnancy.

Thank you very much.