I am 21 year old female. My last periods were on 25th oct for around 3 days. I had sex on 14th nov. My partner used condom also. My periods usually come 2 days late. I was expecting my periods around 27 or 28 .yesterday on 29th I did urine preg. Test it came negative. But periods hasn't arrived till now. I am worried what should I do.

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