How likely is it that I could be pregnant?

Jessica • Mom of 2 boys, 1 girl🧒🏼👦🏼👦🏼26 years young. Engaged💝💍

AF not due until 11/22. Baby danced only once on 11/04. Took a pregnancy test this morning and it was negative. How likely is it that I could a) be pregnant after only having sex once and b) with a negative test? I need hope😭(Sorry if I’m posting in the wrong group)