Am I pregnant or is something else wrong

Ok so my first time was on the first of January, and after that day I started getting cramps everytime I sit down, when I stand up ot goes away. I'm starting to get nervous because I'm too young to be pregnant and I'm not sure when my period starts because I dont track it. I took a pregnancy test on the 13th and it came out negative but the next day he fingered me and it hurt going in and it never does, we used a condom and it didnt break or anything but can anyone tell me what's wrong ??