Ok my last period was Aug. 9th me and my boyfriend had sex 17-28 when the ovulation calendar said that I could get pregnant I know I will not really know with out taking a test but could I be pregnant

Sure you could be. It's a possibility.

Any time you have sex, pregnancy is a possibility.

Are you trying to conceive, is that why you're tracking ovulation?

Unfortunately part of trying to conceive is waiting to see if you have. We've all been there. It's pure torture.

Try not to let it stress you out too much. Stress can make you miss a period too.

Just wait and see what happens. If you miss your next period, try taking a home pregnancy test. Use first morning urine, it's more accurate.

Have you told your doctor that you're trying to conceive? There are things that you should be doing to prepare your body for pregnancy. Taking prenatal vitamins is a good idea, or a folic acid pill. Folic acid is especially important, and most doctors recommend that you start taking it before you start trying to conceive, but it's not to late to start taking them now. Just an fyi, prenatal vitamins usually contain folic acid, so if you start taking them, you're covered. :)

Make sure to eat healthy, get plenty of rest, and take care of yourself. The healthier you are, the healthier baby will be when you do conceive.

All the best to you, and please, come back and let us know how it goes. :)