I tossed off my boyfriend around 12 days ago

I tossed off my boyfriend around 12 days ago, and I'm not sure where he came. A little went on my hands and that's all I can remember. At the time I was wearing underwear and leggings. I licked the cum off my fingers and then went to readjust myself. I touched the edge of the lip of my vagina. I'm not sure if I'm pregnant or not. I haven't had any symptoms but my period is late. I'm usually late and irregular because of my body weight (7& a 1/2 stone) but I don't know if it's that this time. I can't tell my parents or they will disown me for sure and I don't want to lose my friends over this because of what they think of me. I need serious help and advice so please please can someone help me out!!!