Hello,
If you were due to get your periods on the 16/17th and have a regular 28 day cycle, your last menstrual period would have been on the 18-20th of May and your ovulation dates would have been around the 2nd of this month. Since an ovum remains fertilizable only for about 24-48 hours after ovulation, having sex on the 10th,12th and 13th makes it a little unlikely that you could be pregnant.
That said, sometimes ovulation can be delayed and irregular. You could be pregnant and the bleeding that you have now could be implantation bleeding. Please get a pregnancy test done. If it is negative and you do not get a proper menstrual period within the next week, please repeat the test.
I hope this helps.
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