If i were to get a blood clot or a stroke from covid would it happen while i had covid or it can happen even once i test negative a month later?

Could happen later but unlikely. Go to CDC.gov and read more.

Highly unlikely for a COVID-19 caused stroke to occur once the acute infection has remitted. Typically these events occur early in the course of the cytokine reactions, and may affect large arteries. However, rarely, vaccines can cause strokes secondary to venous sinus thrombotic clotting.