Hi Doctor, I Had Sex With My Boyfriend On The

Hi Doctor,

I had sex with my boyfriend on the day my period ended last month . He used the pull out method and he did not cum inside me. We had sex a couple of times and I also took the Ipill within 72 hours.I had bleeding/period after a week of ipill consumption for say 4-5 days. I wanted to understand how long should I wait for my next period?And does this still mean I could be pregnant?
Also my periods are in a way still not regular sometimes . Should my new period date be on the basis of the bleeding I had post Ipill consumption? Or should I consider the original cycle to still remain?

Please suggest the measures to be sure ?