Doctor.. I Had Unprotected Sex On Jan 1st Week.. In

Doctor.. I had unprotected sex on Jan 1st week.. In 1 hour.. I had taken i-pill.. After 1 week I got my period.. On 11 Jan.. And in next month Feb I got my period on 10.. And in march also on 11. And in April.. On 12.. But my last period in April remained for 1 day and it was nt heavy.. As my regular period.. Plz..tell me.. That I can pregnant..??? After taking i-pill and having my periods for 4 months.