Cold sore

My worst nightmare. Since the weather has changed and I’ve been sick the passed 2 days I wasn’t too surprised to see a cold sore pop up. But immediately my heart broke into pieces for my 4 month old. I’m crying right now thinking of how much I have kissed her the past few days not knowing I was going to wake up this morning and have a cold sore on my lip. I know I’m just overly emotional right now but I could literally kill my baby if my saliva touches her skin and make her breakout.. if she does start to get sick from the herpes virus what would be the first signs so I could I catch it as early as possible