I haven't been on my period for the last 4 months?

So Today me and friend who's a guy were having fun in class and he was fingering me as I gave him a ha****b, even tho he didn't cum and i'm a virgin so I don't know how precum feels or does. After school, I was in the mood for fingering myself but I didn't wash my hand that I used in the ha****b and I fingered myself but quickly stopped after noticing that it was the hand i used for the ha****b. Unfortunately, I haven't had my period for 4 months but after the shock that I fingered myself with the hand that I gave a ha****b.....made me so ill, stressed and scared that I went to the doctors for a pee sample test but it came Negative but they recommended me to come back in 2 weeks....Which made me feel worse. I want to know....why do I have bad headaches and i feel like bloated? is a symptom of pregnancy? I will get pregnant from precum that was on my fingers even tho I haven't been on my period for the last 4 months? Please help.