How will the zillion relatives know if you drive to (or take a bus) to a nearby suburb and go to a drugstore? I think you are overestimating how watchful those eyes are. If you are already scared that you might be pregnant, then your judgment is off, which can lead to thinking that everybody is watching you closely whereas in fact people are self-absorbed and preoccupied with their stuff.

The earlier you put your fears in re: possible pregnancy to rest, the sooner you will recover good judgment.

It is unlikely that you are pregnant now that we are in the second half of October, but seeing a negative test is far more relieving than reading somebody's estimates or guesses on the Internet.