Found a spider mite.. 2 weeks till harvest =C.. advice?

i was just out checking my grow and i found a little red bug that looked like it might be a spider might. it was bright red, 8 legs i believe, i squished it with my fingers and plucked the fan leaf i found it on, im not sure what to do though, i only found ONE after thoroughly combing through my plants and making sure there is no more, but i do not know for sure they might be inside my buds if that's possible? my hairs are about 1/4 red and i think i might be able to get 2 more weeks till harvest.. do you think that i caught it early enough to make it so i dont get an infestation of the fuckers?
also... lots of black bugs with wings coming out of my soil, i believe they are fungus gnats, will this hurt my plants in the last couple weeks they have to go?
 
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