Pregnant????

I had sex on March 20. It was unprotected and he did not pull out. I started light bleeding on March 30th and it completely went away April 2. I didn't have to wear a tampon but I did just in case but I was able to use 1 light tampon all day or no tampon all day for those few days. I am peeing every hour to two hours on the dot now. I'm moody. And feel sick all day. I got a really bad headache on April 1st. I'll go from being happy to either crying my eyes out or wanting to hurt someone really fast. Out of no where. I have on and off lower back pain and am constantly tired. Could I be pregnant?..should I wait till next month or the end of this month to test? Or should I test earlier? Or do I have nothing to worry about? Help please!