Is it normal not to have side effects after taking plan b one step?

Hi.. I had unprotected sex with my boyfriend on 27 th jan morning around 5:00 am..he ddnt ejaculate in me.. But might have pre cummed in me:( it qas my 11 th day after my first day of periods.. So i dnt know whthr i was ovulating or not.. I have a very regular period.. After Every 28 days!
And i took plan b one step on 28th morning around 10 am..
I was a little tired and felt a bit funny but i slept off..
I dnt have any symptoms till now ( thankgod!)
In so many articles i read tht u get nausea.. Heaches.. Spotting..Etc..
So is this normal..I mean not havng any of these symptoms??:-(
Did the plan b one step wrk.. ??
I hope i dnt get pregnant!!
I really hope so.. Is there any possibility even after taking plan b.. Bcz i took it within 30 hours !!
Plz help.