Risk of frottage?

Firstly thanks for reading my thread.
I'm very scared now.
Last month I went to a massage shop and had frottage with a girl.She rubbed her vagina againt my penis(it was my first time of receiving this service) and now i'm very scared of this incident.
I have 2 question for risk of hiv transmission :
What if she had menstrual blood during frottage ? (the room was too dark to see). I'm afraid of possible abrasions during frottage which increase the risk?
I had a Determine HIV-1/2 test at the time of 4 weeks and the result is negative. Is this result is believable?Do i need a test at  6 weeks and 12 weeks later ?
Thanks in advance for any reply. (also sorry for my poor english).

[Teak]

You were neer at risk of contracting HIV.

[shimpai2009]

Thanks for early replying my question.
But can you explain for me why i was not at riskof contracting in case of contacting with menstrual blood .
I'm now study abroad, so i can't ask anyone about this incident. I can't sleep well because of this incident.
Thanks in advance.

[Teak]

Because you didn't do anything to cause the blood to enter your body.

[shimpai2009]

Thanks for kindly, fastly replying my question.
As i imagine the worst case: she had menstrual blood, and there were possible abrasions during frottage. Did your last comment still right for this worst case ?

[Teak]

NO RISK.

[shimpai2009]

Thanks for replying me.
So many thanks if you kindly give me some references which explain about this "no risk of HIV transmission" situation.
Thanks in advance.