I had pt during 14days post iui but negative. now i'm on my 19th days post iui and 2nd day missed menstruation. how will i know if i'm pregnant?

.: Pregnancy test depends on the date of implantation and not the time of insemination. So it may have been a false negative - so recheck in 2 days. If not positive for 1 week after missed period check with your infertility specialist. Good luck.

Retake test: Hpt can't predict future, now 5 days later, try another one. Iui done in "cycles" because not 100% pregnancy rate per attempt. Unfortunately, might not be "your cycle" to get (+). Keep trying and follow up w/your fertility specialist.