Not sure how far along I am?

My last period was August 1,

I had unprotected sex from August 28-September 22 and the calculator says I’m approx 9 weeks but that’s impossible because I took 4 tests 3 and a half weeks ago and they we’re all (BFN). Usually I test positive right away, within a week of conceiving I know for a fact I’m pregnant and test positive... my periods are irregular and are about 32-40 days long!

Any guesses? If I didn’t have sex before August 28th I don’t know how it would be possible being almost 9 weeks pregnant?

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