The majority of folks who have oral herpes never have symptoms and don't even know they have it. Assume nothing of your partner's herpes status. Being healthy or not has nothing to do with getting herpes, either. 60% of the adult population has it, and by the age of 50 that number is close to 90%!
You risk transmitting it to your partner even without symptoms. It's called viral shedding, when the virus is active and transmissible even without symptoms. So with a cold sore, it's a higher risk than when you have no cold sore. I have genital HSV1 from my partner who has oral HSV1; in the 5+ years we were together he never had a cold sore.
My partner has never been tested, but has never had a cold sore. They are very healthy, and does not get sick easily. I'm a little confused when you say.."hight than normal risk"...is there still a risk of transmitting even when my lip is perfectly normal without any sings or show of a cold sore?
Can't give you the odds of transmission, but with a possible active cold sore, it's a higher than normal risk.
Has your partner ever been tested to know their HSV1 status?
Symptoms may include sores/blisters, painful urination, itching, and a discharge from the penis or the vagina.and typically can happen anywhere from 2-20 days after. At this point you'll have to wait and see.