Ask ko lang po

Hello po ask ko lang naguguluhan kase ako sa computation ng app na to and ung computation ng doctor sa healthcenter, last period ko is oct 14 2020 Lumabas dito is 9weeks & 1day nako today, but? Yung sa healthcenter is 64days ako? Which is 8weeks and 4days? Sorry naguguluhan ako. Thankyou in advance. #advicepls