Unprotected sex, plan b, pregnancy test, light spotting?!

Okay so boom:

-my period ended Jan 8

-Had unprotected sex w/pull out method on Jan 10

-expected ovulation day was Jan 18

-Took a plan b on Jan 10 hours after unprotected sex (same day)

-Had withdraw bleeding from plan b on Jan 15-18

-Took a pregnancy test on Jan 22; it was negative

-Been having all sorts of cramps and nausea leading up to expected period day (Feb 2)

-Expected my period yesterday (Feb 2) and haven’t gotten it

-Had very very light spotting this morning (feb 3)

I haven’t had any unprotected sex since Jan 10 so is there any chance I could be pregnant? I really don’t wanna but I feel like with timing and the precautions I’ve taken it’s very unlikely. Thoughts?