Oh my god that's disgusting... Have you never had a sex ed program? Using two condoms is a sure-fire way to have one break - or slip off - and cause not only STD's but YES: Pregnancy!! Never ever use two condoms. Two is as bad as using none. One condom is all you need.
Pulling out is ALSO NOT a form of birth control. Pre-cum has sperm in it too.
As for your "symptoms": It's way to early for pregnancy symptoms. Heck, I don't think the egg would even be implanted yet if you WERE pregnant!! So you must be experiencing PMS.
You need to wait a full two weeks after sex and THEN test. Until then, do not have vaginal sex again, even with just one condom. You need to abstain until you know you are not pregnant or at least until your period comes.