Hello and welcome to Healthcare Magic. Thanks for your query.
The fertile period (i.e. the time around ovulation) is period where there are best chances of getting pregnant. But it is not mandatory that you should have sex only during those two days in order to get pregnant.
Moreover, it may be difficult to calculate and predict the ovulatory period accurately. Trying to plan sex around the time you’re ovulating can be stressful. If you’re stressed you’re less likely to have sex as often, which can affect your chances of getting pregnant.
So, you can have sex as often as you want, and in your case (for a 28 day cycle), just keep it in the back of your mind that the chances of pregnancy
will be highest between the 13th and 19th day.
Dr. Jonas Sundarakumar