Missed period?

my period usually comes on the exact day that its supposed to (I have one of those prediction apps). However, this months its already three days late and still not here. I had unprotected sex where the guy pulled out close to my ovulation day and have been majorily stressed since then. I also am sick with a cold.... show more my period usually comes on the exact day that its supposed to (I have one of those prediction apps). However, this months its already three days late and still not here. I had unprotected sex where the guy pulled out close to my ovulation day and have been majorily stressed since then. I also am sick with a cold. Could the stress and the cold be delaying my period or should i worry i could be pregnant
Update: Update- I took 2 tests and they came out positive
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