Any ideas?

So im 15 and my cycle has been anywhere from 24-33 days and it is currently day 35. eve predict my cycle for day 31 so im currently 4 days late. I haven't had sex but I've been eaten out and fingered and im sure im not pregnant from that because no cum was involved. Im starting to worry because a week from today I had very bad morning cramps and had this stretch almost off-white discharge. I couldn't be pregnant right? I took the "sugar" pregnancy test and it dissolved so Im hoping i get my period. Im stressing about it a lot because homecoming is in a week and i don't wanna feel like this when im there. Can someone please tell me if this is normal?