I'm confused! I used a pregnancy calculator online and it told me that my ovulation date was march 14 my conception date was march14 and my implantation date was march 23. It also said that I was already two weeks pregnant before my conception date does this mean I go pregnant right after my lmp which was feb 27

It means that the online calculator is only as good as the information given it, and even then only a estimate, since every women's body is different. Is there any concern over when conception happened, like multiple partners ? At best you can get your conception down to a week or two time frame, never an exact day.

Calculating conception dates is an inexact science. Conception calculators can only give an estimate. The only way to pinpoint a conception date is if you had intercourse once and only once during a period of at least a month on either side of the possible date.

P.S. for future reference the title of a question is for a brief description of your question. Use the larger box to type your full question. I adjusted this for you.

I agree with both posters above with one small note. Even if you only have sex once during a cycle that is not necessarily the day you conceived. Sperm can live up to 5 day in the "right conditions" inside a woman's body. You could have sex on Monday, ovulate -and the egg is fertilized- on Wednesday. That's part of why its an inexact science.

Online calculators ask for either your LMP or ovulation date. It's nearly impossible to know your exact ovulation date without specific measures taking place. If you go by LMP, it assumes you ovulated on day 14. I have charted ovulation for years and I have ovulated anywhere from day 9 to 19 in my cycle which most women experience. Rarely does a women ovulate exactly on day 14 each month. This is another reason why calculating due dates is inexact.

As you progress and get measured by ultrasound, it will become accurate but it can still be a day or more off on the exact date (some babies measure bigger or smaller than normal).