It is normal,Understanding that your menses are regular and had your periods on 28th of Feb, and as you mentioned that your periods got over on 4th of March, having Intercourse on day 5, was the safe period, in such case Ipill was not necessary.
However now that you have taken Ipill, it being a hormonal tablet, it can cause menstrual irregularities for this month. Your periods should come by this month end, incase you don't get your periods , get a serum
beta Hcg checked or a urine
pregnancy test.
Consult if further suggestions are required.