Ok seriously freaking out. Anyone gotten preggo with their husband having a vasectomy? My husband…

Ok seriously freaking out. Anyone gotten preggo with their husband having a vasectomy? My husband had his done nov 2018 and went and got tested to see if it worked. The Dr said should be good but to test again in 6 weeks. Well we didn't test again. So almost 4 weeks ago I had a period super heavy. Then I spotted for the past 3 days not even enough to wear a pad. It's gone now. Been super tired, dizzy, don't want nothing to eat, head ache for days, nauseated, no motivation or energy. Ughhhh I'm seriously starting to panic.