If you have had a cold sore before, it will be in your body forever. Now if you passed it on to your girlfriend, you will need to go to the doctor and have it figured out. Normally, cold sores don't pop up on the gentital area, but she could possibly develop herpes, which is what cold sores basically are.
Yes I am Intune with these cold sores I've been getting them as long as I can remember so I know As soon as one turns up I know the day I did it there was no chance of one being there so I should take that as a no risk ? Like I said I noticed last night 24 hours after oral when a red area appeared straight away and knew I'd have one in the morning thank you for your help
There is always a small risk that you may be shedding without knowing it and this results in an infection.
The virus is usually present only a few hours before the red base starts to appear and even less if you are in tune with your body and know that familiar tingle. Hence a day and half or so is too long to represent an elevated risk.