frequent taking i pill
can cause menstrual irregularities anyhow as you are having regular periods it is ok,
when semen deposited some excess amount will come out so that usually will not affect fertility
as only one sperm is needed for fertilisation,
if any other semen abnormalities like low number of sperms, decreased motility etc presents they should be corrected,
you trace ovulation with kit and plan intercourse on that days which will increase the chance of fertility.