The best time to conceive is roughly two weeks before your next period, during ovulation. At this time, this is when the average female body is most fertile. What you need to first do is to work out your approximate menstruation cycle days. The first day you bleed, will be day 1 and the last day of your cycle will be the last day before the next period. So if you bleed on June 3 and and then on July 3, your cylce is exactly 30 days. July has 30 days, so your next period will most likely be August 2. Two weeks before August 2 (July 19) would then be the most likely day to conceive.
The dates I would then recommed for sex is a couple of day before and a couple of days after, but certainly most around the 19th. Something like 16th, 18th, 19th, 20th & 22nd. If the August period comes, again work out the cycle days as above. Cycles can vary from month to month, season to season or year to year, so keep a good record of the first day of bleeding and continuosly work out the number of days of the last cycle and use that for the next motnh.
Yes, this can be a bit confusing, so post up if you are unsure I will attempt to assist. Good Luck