Hi, Thanks for using HCM.
Since no bleeding since Feb 19th and UPT positive on 22nd march but no sac in uterus
according to vaginal USG and small bleeding 2days back. You can get done blood HCG
level and USG abdomen and pelvis to diagnose pregnancy
or rule out any other cause including extra uterine pregnancy. UPT may give false positive(can repeat it again) and bleeding happened only 2 days before (It may be delayed bleeding or abortion
if she is pregnant), consult your gynaecologist for examination and management.
Hope I answered your question. Feel free to ask me if you have any further queries.
Wish you good health. Take care.