need help!!!!

So I'm really worried that my period hasn't came. When ever I'm unsure (sorry for what I'm gonna say) I stick a finger up my vajaja to see if my urethra is low, and it's not it's facing away or something. I'm also having a lot of white discharge. Someone please help me. Plus I haven't taken a pregnancy test obviously, because I'm scared and I don't want to be seen buying it or anyone to know.