welcome and thanks for consulting,
since you have finished with your oc pills in the mid of april you must have got your periods recently.
from your history i can calculate that there is a irregularity of 2 to 5 days in your periods. this is not a big gap.
a women ovulates 14 to 16 days before the periods starts,
so you should try to have intercourse every day by the end of 2nd week and the third week of your cycle .
the effect of OC pills may remain for 2 to 3 months once you discontinue them.
once discontinued oc pills don't have ant side effect on pregnancy
may god bless you.