I had a similar situation, tested IGG negative <0.2 at 6 weeks, now it's been 16 weeks and I'm terrified to test again but I know I should. The only symptoms I've had are constant burning sensation in and around the penis but no visual signs whatsoever, the doctor thinks I have CPPS but in not very reassured knowing thar my exposure was with a hsv2 positive female.. She also pit me at risk and only disclosed her status after the fact.. Which I find very evil
Hi -
1 - You can retest at 16 weeks with an IgG.
2 - Your IgM should be ignored. I'm not saying your test was wrong, but the test is unreliable, and shouldn't be done on adults. Your IgG at 6 weeks is a great indication that you don't have it, as many people will develop antibodies by 6 weeks, but you do need to retest at 16 weeks.
3 - If you get symptoms if you're infected (and not everyone does), you may get blisters or sores, itching, and if it is a primary outbreak (meaning you don't have hsv1 or 2), you may get flu-like symptoms (headache, body ache, swollen lymph nodes, etc.). The average time for symptoms is 2-20 days, so it's a good sign that you haven't had symptoms.
Another note - yes, a woman being on her period can trigger an outbreak, but this is not a hard and fast rule. Not every woman gets an outbreak on her period. Many don't.
The fact that she knows she has herpes puts you a step above - she knows what her symptoms are, and when to avoid sex. This doesn't totally eliminate your risk, but it does reduce it. You are safer with her than you are with someone who has it and doesn't know it. She absolutely should have told you before any sexual activity, of course, but I hope you find some reassurance that you were a little safer.
Being male, if all you do with a female partner is avoid sex during an outbreak, there would be a 4-5% chance of transmission over the course of a year. Many couples go years without transmission. I don't say this to excuse her, but to hopefully give you some peace of mind.
Get your retest at 16 weeks, and if it's positive, let us know, but I don't think you have a lot to worry about here. (Yes, I know, that's easier said than done.)