How many weeks am i without knowing my last period?

Ive always had irregular periods theres times i would skip a month with no period. Can i find out how many weeks i am with the date i last had unprotected sex since i cant remember my last period? I had sex on july 23 and its august 24 today all my pregnancy tests come out positive btw and i have an appointment for... show more Ive always had irregular periods theres times i would skip a month with no period. Can i find out how many weeks i am with the date i last had unprotected sex since i cant remember my last period? I had sex on july 23 and its august 24 today all my pregnancy tests come out positive btw and i have an appointment for an ultrasound on august 26 but i dont want to show up just yet if im too early for them to detect anything just yet
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