Well first I didn't actually have intercourse but he finger me and when he was about to go in he pulled back and said he was about to and he just left me. After he had left I've been felling bloated and my back will hurt.. Breast will get sore. What could it be? I'm young and I'm scared to tell my mom but I took a pregnancy test and it said negative but what else can I do?

Did he actually penetrate you?

You shouldn't be having sex most likely, however, if he did not ejaculate inside of you, the odds of you getting pregnant via precum are very small. Also the Pregnancy tests ate designed to pick up even the slightest amount of hgc so if you were pregnant more often than not the test would have been positive.

Symptoms of menstruation are very similar to those of pregnancy, and they magnify often when you are worried.
If his penis didn't go in you the chances a sperm made it's way out of his penis and up a fallopian tube are very small.
The question is, why were you willing to have unprotected sex? Sounds like a rare and nice young man who walked out on you. Refrain until you have the pill or patch. Don't rely on condoms.
Hopefully the worry you are experiencing is telling you this all by itself. Right?

A pregnancy test is only effective AFTER you miss your period. When is your period due?