Yep this is the best advise possible!
As for the your cycle, I take it that you mean finished your cycle
to be that your uterus had just shed all its lining (the lining is
there for the fertilised egg to embed itself). Since it is the end
of the cycle, the uterus has no lining for any embryo to attach)
and at the same time it is uncommon for your ovary to release
another egg during this period (uncommon yes but not unheard of) so
the chance of pregnancy is very low.
nevertheless, please please protect yourself and not engage in high
risk sexual activity. you dont need this trouble.
sex is created to be fun and to surprise the committed couple
(depending on your belief - marriage) but if you use it this way
you may end up in trouble like so many unwed pregnant women

Its a fact of life, the more a girl gives of her body before
marriage the more she stand to loose... sorry but its true.