Pregnancy help

Hi! I had a miscarriage Jan.6,2021. I have my period regularly. I recently took food supplement Paragis Guyabano Capsule and my last period was Feb.3,2021, supposed next period was March 1,2022. 6days delayed now but still pregnancy tests says it's negative. Please advise. Thanks! Btw, Just turnef 35 this Feb. Hoping to read your comments and suggestions. Please. Thanks in advance. #pleasehelp #advicepls