My girlfiend lately has been having back pains, cramps and etc...

so my girfriend and have had sex and all, protected sex with a condom EVERY time. we took a test after a few times and it came out negative....theres was this time were she got scared because when i pulled out with the condom there was some of i think her wetness on it. we did the water test with the condom and the condom was not broken or torn, nothing came out. so we rushed and went to get a plan b pill and she took it to be safe. a few days or weeks pass by and she gets her period early, is that normal? 10 days early. but yeah, lately shes been having back problems but shes always had back problems, so idk? and she gets cramps pains? what i need to know is this normal?

and one day she was in the shower and she noticed some white stuff come out of one her nipples but i googled it and it said its its normal for nipple discharge for young teens. is it??

what i also need to know is that she recently got her blood drawn out and got results and all negative. wouldnt the doctor tell her if she was pregnant or not since they drew blood from her?

need helpppppppppp pleaseeeeeeeeeeeee. thanks
mike gunston.