Unprotected sex feb. 24 took ecp 3 hours after the incident then 3 weeks after took pregnancy test negative but no menstration today is march 19?

Unprotected sex: At any time always has the chance of becoming a pregnancy, and/or one of many various std's: hpv (which can cause cervical cancer), herpes, gonorrhea, chlamydia, crab lice, trichomoniasis, etc. Using a hormonal birth control is generally a good way to protect against an 18 yr ball ; chain-but condoms are really the way to protect from the others.Recheck preg test with first morning urine is best.