Just found out I'm pregnant..how far am I?

My last period was feb 6th, and I believe I ovulated around march 3rd. My cycles are usually off a week or so from the typical 28 day cycle. I believe I was supposed to get my period somewhere between the 19th of march to the 24th of march.I'm a little confused as how far I am. How far am I if I didn't ovulate till 3 weeks after my period..? I keep searching to find the right gestation for my baby but it's hard cuz if I go by my period I'm 9 weeks. But if I go from my approximate conception date...I'm 6-7 weeks. can anyone help? :)