Two Days Ago I Had Unprotected Sex With My Boyfriend

Two days ago I had unprotected sex with my boyfriend and took a plan b one step within 15 hours, I started getting bad abdominal pains and was really emotional, today I've had cramps (at random times) and feel very bloated, I've also noticed vaginal discharge more exsessive than normal, but its the same constancy as normal and has no smell, I've also felt very nauseous is this normal?
I also never got a period this month, for the past 4 months I've only gotten a period every other month, so should I expect a period within 3 weeks? Are these side effects normal? I'm freaking out.