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For your issue of to change the contraception
Condom is best ever for the contraception.. because it can not any contains which have to take internally. So that there is no side effects in it. If you try pills, may it can make such changes in your body
Secondly you got delayed periods this month, so that you are thinking to change. but you should have to wait for three - four cycle and have to watch. may be it was for this cycle only. and many more things are invlove in it. Just like such hormone changes, your stress
and weather also.
Sometimes Diet which make you body cooling also make changes in it.
Purely advisable for condom..