Starting to get scared

Traniece
I had sex Saturday before Valentine's Day and we didn't use a condom I had made sure I was not ovulating and he pulled out I'm  starting to get scared i keep checking for sings and I have not had any but I'm late on my period I'm always checking my weight and I'm not gaining weight I'm losing weight I went from 127 to 123 in like two days but I had one day where I had cramping in my stomach all.... day but the next day it was gone I want to get a test but I don't know how to get one without my mom finding out I told my mom that my period was late and she said she would take me to the doctor buts it's been late before I'm just really scared and I'm only 15