you are not pregnant!!!
i'm sorry you're not feeling well, but i've already told you the odds of getting pregnant under those circumstances is .000000000000000000000000001%. if you did get pregnant using condoms, the pill, and the morning after pill, then i would keep the baby since it's obviously the next baby jesus.
i know nothing about side effects of the morning after pill. i do know that there are numerous reasons you could be feeling nauseous, too many to list.
if you're worried about it take a test when your period is due. however, i think the morning after pill messes with your cycle and you might be late because of that.
did the person who gave you the morning after pill know you were already on the pill?