hpt Positive yesterday but negative today

Prabha
I have regular cycle of 28 days. My last period was on Dec 22nd.. No period in January. Just spotting for two days from Jan 23rd. Blood test showed not pregnant in January. No period or spotting in February. Tested yesterday. Got a positive. But today all tests are negative. No cramping or bleeding. Can you tell me if I am clear that yesterday is positive. Then why I am getting negative. Scheduled for appointment next week.

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