I had unprotected sex this month. My period first day was 5th jan. And I had sex on 13 to 16 jan. Is any chances to I get pregnant? I already check urine test bt it shown negative. Which day is best for check pregnancy? My period cycle is between 28-31 days.

I think yes

Lets give an estimate date of your ovulation dates which should have been between 19th to 22nd January then if you had sex between 13-16th it could mean that maybe the sperms would have been hanging around your fallopian tube to 21st January.