Thank you for your medical query at AskTheDoctor.com
I understand your concern.
Considering the cycles are regular, and it is a 28-30 day cycle, the chances of getting pregnant around the 19th or 20th day of the cycle is extremely low, since the ovulation occurs around the 12th-14th day.
But this can never be predicted and if there is a possibility, kindly take the pregnancy test to rule it out.
Hope this was helpful,
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