Ok, you have been pregnant for a long time now and are probably due soon. Have you not been to a doctor or had any ultrasounds???
Going by your dates you would be due about the 12th of Oct.
My LMP was Jan 5 and I am due Oct 11. I have a 26 day cycle (you did not state your cycle length) but either way if your LMP was in Jan then Oct is when you are due. If your dates are dated by ultrasound then I would be concerned because it goes on measurement of the fetus.
There are websites that you can punch in dates (LMP) and it will give approx. dates of conception but you need to know your cycle length.
As I said in my earlier post there are many sites and this was the first one I went to after Googling "due date predictor". Punch in your dates of your LMP and it will tell you when you most likely conceived according to your cycle length.
Good Luck to you!