So On January 8th Of 2016. I Tried To Have

So on January 8th of 2016. I tried to have sex or almost had sex so there was no penetration. The only thing happened was that he put his finger inside me and that his penis touch or slightly trusted in my vulva for a few seconds. After that, I got my very light period that started January 23rd 2016.. which only lasted 2 days but very light. It only occupied quarter on my pad for 2 days after that I experienced a light pink spotting which lasted 5 days. Also, I had breast soreness before that period and it subsided once that light period began. On top of that Ive been very stressed out and paranoid since January 8th when that happened. That was my first sexual experience and my partner did not wear condom. Now I am very worried why this period is so different from my normal cycle. i am also experiencing dizziness for almost a week now. I have given myself a pregnancy urine test and everything came back negative.