I think cycle = on your period.
yes, you can get pregnant if you have
unprotected sex when on your period.
Sperm can last up to 5 days, and you can
easily ovulate in time for the sperm and
egg to meet up.
However, if you're on birth control pills
and you're taking them properly than the
chance that you can get pregnant while on
your inactive (bleeding) days is less than
1%, same as the weeks when you're on the
pill.