Lmp 3/28 regular 28 days cycle. two early u/s at 8w1d & 13 days later 9w5d (different place) possible conception date or sex that lead to pregnancy?

Not enough info: You have not shared enough specific information in your question to give you a valid answer. But, that does not matter. You can verify almost everything you need to know about your pregnancy online. I suggest you start here: http://www.babymed.com/conception-calculator. This is a conception calculator and it will give you the date you conceived if you enter all the information correctly.