It depends. Did your partner tell you if he was having an OB at the time of your encounter? Did you get a good look at his penis, and see any sores? If you didn't see any, the chances of you contracting GH are lessened. However, viral shedding is possible w/o visual symptoms of an OB, but this is only a small percentage of the time.
The GP you saw was correct: without open sores that can be swabbed, you must wait several weeks before you can get accurate results with a blood test. If you are truly concerned, get a blood test at 7-9 weeks, and follow that up with a test at 12-16 weeks. At 7-9 weeks the blood test results will not be 100% accurate, but if you are positive for HSV there is a large chance it will show up.
Also, if you ever experience genital symptoms, see your gyno immediately.
ejaculation has nothing to do with std risk.
condoms only reduce the risk of transmission of herpes by 30-40%.
In your situation, discuss with your partner if he's had other partners and when he last had sex testing done. since it was unprotected sex, herpes isn't your only concern from this encounter. Otherwise it's up to you when you want to test for herpes , if at all. find out if your partner has hsv1 or hsv2 genitally. Ask if he takes daily suppressive therapy or not. your risk from a one time encounter isn't worth testing for to be honest. your status because of having had sex with a partner for a year who has hsv2 genitally, is worth testing for. make sense?
grace