Slow Computer

I got really busy since last week for the birthday of my husband , and now I need to catch up with work. I am blessed to have a great employer and team  , I can't ask for anything more. They have been so supportive of me since Day 1. Just when I was about to go full time today, I noticed that my computer is slow . I really wonder why? It doesn't hold too much files and I don't usually stuff it with anything not important. Could it be a virus? I hope not. I will try to read more articles and see what could be the problem. I can't afford to miss work today.