You'll need to start learning your body's cycle. Figure out how long your cycle is and whether it's regular, and use an online calculator to determine when you might ovulate. Have sex a few days before you ovulate, and every day until after you do. (If your boyfriend has a low sperm count, you might want to have sex every other day instead.)
It can take up to a year for a couple to conceive, so don't fret if it doesn't happen immediately.
If you're irregular, perhaps you should start temping. It takes a little while to establish and you'll have to get yourself into the habit of taking your temperature at the same time every morning before you get out of bed and start moving around, plus you have to chart your temps for a cycle or two... but it should help you figure out when you're actually ovulating and give you a better chance at getting pregnant. Or maybe you should ask your gyno for tips on how to regulate your cycle.
Basically what you would be doing is checking what your body temperature is at the same time every morning, before you get up and start moving around (which increases it). When you ovulate, your temperature raises slightly. So when you learn what your "normal" temperature usually is, you should be able to figure out "Oh, it's higher than normal! I must be ovulating!"
It takes a cycle or two to really get the hang of it and be able to recognize the signs of ovulation.
If you haven't yet, download Ovusoft's fertility software. They have a free trial, and I like their program the best out of any I have ever found. You can also use it to NOT get pregnant as well, but where's the fun in that
I highly suggest using Ovulation Predictors. They are alittle pricey, (about $15-20 per pack at the drugstore) but they will tell you if your ovulating. I wish I would have used them the first month I started ttc because I do not ovulate on my own. I come close, and temping never worked for me, but they told me in 1 month what I needed to know, and I was able to make an appointment with my dr. and get it straightened out.
I suggest going to fertilityfriend.com and signing up. They have a free membership as well as a vip. They will send you tutorials and they have some great references. A lot of us use that site and really like it.
Hopefully we will be able to help with any of your charting questions.
Have you been to your dr for a pre-ttc consult? It is very basic, but I highly suggest it.
go to downloads.com and type in ovusoft fertility software. It's easy to use, and it even tells you what chance of pregnancy you have for that month on each of the days you bd and all kinds of other stuff like that. The trial is 15 days, and after that you must purchase it to continue to use it. I'd say its worth it though. There are many stories of people getting pregnant with it on the first try because it really is simple and lets you understand what's going on with your cycle.
Oh, and she's right... you really should start taking prenatal vitamins the month before you conceive. You can take a multivitamin like women's one a day (it contains 100% of the amount of folic acid you need, the vitamin that's really important in pregnancy, and it doesn't contain a lot of the "bad" vitamins that can be harmful in large amounts), or you can just go to walmart and get prenatal vitamins off the supplement aisle. You don't even need a prescription.