Random Question!

Hi so random question.... I'm 5dpo and yesterday afternoon out of nowhere I feel my bottom lip start to swell up. I run to the bathroom and notice I have a cold sore. I haven't had a cold sore in easily 5-6 years. I was reading that you can get them while you're pregnant because of the huge hormonal shift but is it possible to see this happen so early?? Any advice or comments would be greatly appreciated!