Thanks for the query to H.C.M. Forum.
Due to HCG
sometimes a false positive test comes.
Now you stated that there was period and that in full.
The best way is get a home pregnancy
test after 7 days of menses ends.
For double sure get twice home pregnancy test 1 day after first test.
If you are pregnant get an ultrasound
for confirmation of pregnancy and fetus in uterus.