Late period

I'm so scared. I'm 18 with another year of school ahead of me. I've had sex with 2 different guys since my last period. Both with condoms but I'm waiting to go on BC. I'm 3 days late and last week was a week from (would be implantion). I was experiencing mood swings and a ton of other physical symptoms but I dismissed it as period systems because I get them a week before normally. Well my period hasn't come and I'm so scared. I can't tell if I'm making myself feel different at this point. It feels like I'm going to get that period but clearly my senses are wrong. I've have white discharge for a week but normally I had whitish anyway. Lately it's cream like though