Last period was 16.11.22.had protected sex on 14.12.22 my due period was 23.12 but it didn' come.did a blood test 21 days from sex.(1.8) again did a blood test 29 days from sex.(1.6)got bleeding on 14.01-18.01. is this implantation bleeding or period?

If one is not taking oral bcp's, delays in ovulation may explain why one's menses are also delayed. See your GYN physician for guidance, and ask about low dose oral contraceptives (bcp's) and other testing (ultrasound to diagnose possible PCOS (polycystic ovarian syndrome).

Far more likely to be period and not implantation bleeding. Implantation may cause spotting but not usually frank bleeding. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex : https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines Get HPV vaccine.