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Delay in periods is a common problem. You need worry about them. wait for 5-6 days for your periods.
Coming to urinary to positive pregnancy
test it could be due to hcg
Pregnancy test kits determine the presence of HCG in urine which are often raised in pregnancy.
As you have been on hcg drops the test could be false positive for pregnancy.
Half life of HCG is usually around 30-35 hrs. So, it would take 5-8 days to be completely out of body.
Repeat the test after 8 days if you dont get periods in the meantime.
Based on the result w can take a call.
Wish you a healthy life