Any ideas?

i need someone else to think for me. my boyfriend came in me september 22nd which was the day after i got off my period, took a plan b probably 50 hours after. a week later i started bleeding again and bled for two weeks. now i’m a week late but had a negative test tonight, i took it about 7pm. my backs been hurting and i’ve been pretty sleepy, but i also have been going a lot more lately. i’ve felt nauseous a little bit the last couple weeks, feeling like i’m gonna puke at random moments. I’ve also had a thin, white discharge which is very unusual for me! latest i’ve ever been is like 3-4 days. i haven’t been stressing over it because i didn’t notice till today when i checked my app. i’m not thinking too much into it or worrying, just wanted someone else’s input and to see what you think, pretty late period or not high enough hcg levels? i’m just looking to see if anyone else has gone through anything similar?