I need answers please

So I'm sorry if this is tmi but, I had been constipated a little bit in the past week and was trying to go and you know pushing a bit, now I am concerned because I've missed two periods, and I feel like I'm getting cramps, I recently stuck my fingers up there and was a little panicked that I felt a lump or like my uterus just a few inches in, I've been googling stuff and I'm really scared that my uterus prolapsed but I'm not sure. I felt around a little and it indeed does feel like my  uterus. I'm scared I don't want to tell my mom ( I'm only 15 ) and I definitely don't want to visit a doctor........ what should I do?