Chances of getting pregnant if condom was big on the guy?

Possible: Any material from an excited male penis can get you pregnant. It is more likely at certain points of the cycle, and with a full "load" rather than small amount. It really only takes one sperm do do the deed.The condom should be tight when he is erect and intercourse should stop if the condom becomes loose. Proper sizing is important if you want to avoid pregnancy.