Pregnant? Please take the time to comment

So I was supposed to start my period today. I have no signs that I am going to start. Only thing is I am super tired and really thirsty. Been going to the bathroom a lot. Last week I had very mild cramping and that was it. We had sex almost everyday of my while I was ovulating So I am just wondering.. could I be pregnant? How soon can I test to get an accurate result?