Thanks for your query.
Since you are having positive pregnancy
tests at home, please confirm your pregnancy by visiting a gynecologist at the earliest.
She would confirm it by ordering a blood pregnancy test or by an ultrasound
Sometimes, early scans, specially if not done trans vaginally, fail to identify an early pregnancy.
Also, because of the spotting or light bleeding alongwith positive pregnancy test, you should rule out an abortion
or ectopic pregnancy ( pregnancy outside the uterus
Please consult your gynecologist and do the needful