How soon can you get pregnancy symptoms and what are the symptoms?

I was just wondering what is the soonest you can feel pregnancy symptoms? And what are the very first pregnancy symptoms besides a missed period? My husband and I have been TTC for a year now and I was just wondering and thought I would ask. Also, I have my period the 28th of every month so I therefore I had my period on Junuary 28, 2009, and have so far had sex with my husband the 6th, 7th, 9th, 10th, 12th, 13th, and the 16th. What are the chances I could’ve got pregnant?