Ok you are must fertile (best chance to conceive) is about a week after your period is over. To be sure just order online or go to a store and buy ovulation tests. Their almost like pregnancy test... You will dip the stick in urine and it wil either show 1 line (meaning you are not ovulating and there is mininal chances you will be pregnant) or it will show 2 lines (you ovulated and there is like a 24 hour time frame. There is usally like 5 sticks so that you can test for 5 days. When you see 2 lines have sex that day and then they say to do it every other day. This will maximize the chances... That would be the most helpful way in order to find out when you can get pregnant.....Also try to stay in bed for as long as possible after ejaculation so the sperm have time to swim... I hope this will help...

Good luck...

Thaxx alot I been trying hopin this information will work its worth a try im ma pray hard too. Um wat kind of kit to buy any ovulation I can buy ?

Not all women's cycles are the same so when you ovulate may not be anywhere near when another woman ovulates. I have heard a week after your period, I have also heard (more commonly) 14 days after your period is when you are most fertile, but those are just statistics. It is going to depend on your cycle.
So, like the above post said to be sure and find out when you ovulate, buy a ovulation test kit.
You don't have to lie on your back for 15 minutes after sex to get pregnant, otherwise, all unwanted pregnancies could be avoided by standing up afterwards. But, it will definately help. Try not to pee right after sex, and stay laying down for a while. Also, wait a little while to take a bath also, just at least an hour.
And relax! The best thing you can do is relax! Just enjoy the sex you are having with your partner and don't stress about trying to get pregnant. Most people get pregnant when they stop trying, or aren't trying. So have fun!