I know that noone can give me an exact answer and I'll need to go to my doctor to get an accurate answer buuuuut I thought someone maybe could help me out a little.....so I just found out in pregnant. I'm trying to figure out how far along I am and my due date (just for fun until I see my doctor). so my first day of my last period was on February 11th. I ovulated and conceived on March 19th. since my average cycle day isn't a 28 cycle day, how would I calculate how far I am? some pregnancy calculators say my due date is November 18th (based on the first day of my last period) and some calculators say I'm due Dec 10th (based on the day I conceived) . so my question is, even if i conceived a MONTH after the first day of my last period, do I still calculate my due date based on my period? any insight would be GREATLY appreciated