No, not quite. The typical cycle is 28 days long, almost a month. The first day of your period is considered day 1 in your cycle. Ovulation (peak fertility) happens around day 14. So the perfect 28 day cycle looks like this:
Day 1: Period begins
Day 5: Period is ending
Day 12: Ovulation incoming
Day 14: Peak ovulation
Day 16: Ovulation is ending
Day 28: Cycle is ending, period coming tomorrow
Sperm can live in the v****a for a few days. So if you had sex right after your period you'd risk having sperm still alive when ovulation time comes. That means the safest time to have sex is usually right
after ovulation and right
before or during your period assuming you don't have periods that last longer than a week.
However, it's important to keep in mind that pregnancy is a possibility any time of the month. That's because most of us don't have that perfect 28 day cycle. And that means most of us don't ovulate like clockwork on day 14 either. Most of us have no idea when we actually ovulate; we could ovulate early (closer to day 12 in our cycle for example) or late (closer to day 16). So while there might be "safer" times, there's no such thing as a "safe" time, which means you should assume you're
always fertile and use protection every time.
But avoiding sex when you're ovulating is an ok backup method for couples who use another non-hormonal method of birth control (such as condoms, spermicides, diaphragms, etc.). That is called the natural family planning method. I don't recommend it as a main method for most couples because it takes a lot of self control and can be easy to mess up.
If you want to try to learn more about your cycle, visit www.mymonthlycycles.com They have a calendar so you can easily keep track of your periods. Once you put in a couple periods, the site will start trying to predict your future periods and ovulation if you have a fairly regular cycle. You can also watch for signs that you're ovulating. One such sign is having discharge that resembles egg whites, clear and sort of stretchy. You can also keep track of your temperature as it rises slightly during ovulation. You can read more at
http://www.irh.org/nfp.htm