I don't know what to do!

Ok so I had sex on the 3rd which was two Friday's ago and I was fertile, we didn't use protection we used the pull out method.. Yes I know stupid.. It's been 28 days my periods hasn't come yet but I'm not normally regular should I take a test or no? I've had symptoms like a head ache, tired, nauseous at night, my boobs look huge and hurt. But those can be signs of my period what's do I do?