Dear Nehal,
The paragraph quoted below from http://www.beyondfertility.com/art96.htm seems to answer your questions. If not, you might go to this site or others to find more info. I did a search for "trying to get pregnant," and a lot of sites came up. Also, searching for "pregnancy," I came up with many sites to help you and your wife when she is/does become pregnant.
"If you know when you are ovulating - try to have intercourse for several days before ovulation, as well as the day of and a day or two after. Usually an egg will only live for 12 to 24 hours. Sperm can live up to 5 days in good quality cervical fluid. Drink lots of water - this will help to increase your cervical fluid. Also, start taking prenatal vitamins - either from what your physician prescribed or over the counter. The folic acid is very important to start taking before pregnancy occurs - this helps to eliminate neural tube defects with the baby."
I hope this helps. With the info you provided and that found in the above paragraph, it seems like congratulations could be in order even now.
Good luck and best wishes to your both.