Like applegreen said, his sperm count and quality is really important. If it is low, ejaculation every second day is preferable to every day.
If you are using lubrication make sure it is sperm friendly (like Pre-Seed).
It helps if you have an orgasm within 45 seconds of him ejaculating (before or after). Research has shown that sperm can get up into the fallopian tubes to the egg within seconds when this happens. (And it is more fun for you

)
Your partner needs to avoid getting his "equipment" too warm. Heat is the enemy of sperm. Looser underwear and staying away from hot water (spa/hot bath) will help.
A healthy lifestyle - The egg begins to prepare for ovulation as far as 3 cycles in advance. Anything unhealthy (drugs, alcohol, ..) can affect it in those 3 months.
You need to learn to track your ovulation with either ovulation kits or basal body temperature (BBT) and cervical mucus.
Timing baby making sex around your ovulation is the primary way to increase your chances if everything else is good. (It is actually not only the primary way but the only way to get pregnant from normal sex.) If you know when ovulation gets close, you can do what you are doing and make sure you time sex right.
The rest of your cycle you can then have sex for fun. That way you take some pressure off your partner to perform. Men normally get pretty bored quickly with just the vanilla baby making sex and that can put a strain on your relationship.
Best of luck!!