Then, here comes the TMI: pay attention to when you wipe, specifically, fluids from your vagina. At some point, it will start to get a little creamier instead of dry. Then, you will have way more liquid than normal, likely a higher sex drive than normal as well. For people who are very seriously working hard, they actually can feel their cervix and pay attention to how high or low it is, and if it's open or not, but we'll assume you don't want to go that far. You could test cervical mucous between your fingers to see how stretchy it is or even take your temperature at exactly the same time every morning before getting out of bed, called the basal body temperature.
When you are getting more fluid than normal for a couple days, you can generally safely assume you're about to ovulate or have that day. Baby dance! Remember that the egg, after dropping, needs to be fertilized generally in less than 12 hours. Your real goal should be having sex right then, or even in the couple days beforehand, since Dad-to-be's swimmers can stay alive for days, waiting around for the egg. But there's nothing that says you can't have sex for days in a row either, of course!
Just charting the couple days in the middle of your cycle when you feel a higher sex drive and more wetness than usual is a simple step to learning how your body works that can make a huge difference in your attempts to get pregnant. Note too, though, that there are women who ovulate nowhere near the middle of their cycles as well, so knowing your own body means you definitely can help pinpoint the exact couple days that will be most likely to get you pregnant ... which also will help you relax and not worry about TTC for the rest of the entire month.