Ok so I am pregnant, but i need to know?

ok we just started trying to concive this is the first month, yay hoo..... well we took two tests on the 14th the day aunt flo was supose to be here, one the 15th and i just had to go to the store a few mins ago and got another and just took it. and vola all say i'm pregnant. I have a DR. appointment monday for the preg test before they will set any other apt. up. but my question is how far along am I? and when will the baby be due? I have used quite a few due date calculators online and they are saying Dec20, Dec21, Dec22 and Dec23. I have gotten all these answers, still using my first day of my lmp which was Mach16th. and my cycle is 30 days long. some of these calculators asked to my cycle length. I am pritty sure that i ovulated on day 14 of my cycle. so lol can any one help please i'm going bonkers just waiting till monday. thanks for the help