Hmmm,
Well, i don't think i am at all qualified to give any good advice to you simply because i am going through a very bad time of my life too. I am feeling painless and hard lymph nodes all over my body now. (armpits, inner elbow, groin, and too many to count lymph nodes in my throat, which are diagnosed by a doctor / physician).
Maybe you can refer to this thread of mine, if you want to, if you are interested in the anxiety i am facing as well:
http://www.medhelp.org/posts/HIV-Anxiety-Support/Please-help-and-give-me-your-opinion--please/show/1289192
But well, if it offers any solace at all, I shall attempt at my 2-cents-worth of my personal thoughts.
Firstly, he came onto your chest, and not onto your eye or nose, which is good thing, as HIV can't be transmitted past your normal skin.
Next, you mentioned that the lymph nodes in your armpits swell regularly when your periods come, so now that you mentioned you are having your periods, the armpit / axilliary lymph node swelling sounds like a "normal" event.
While I can't say, as an outsider, and a non-expert, that you don't have HIV for sure, it seems like your chances are far far better than mine, and some of us here. Simply from the details of your encounter, and your seemlingly lack-of-any-symptoms seem very comforting.
Furthermore, it's been 2 and half months anyway, as you have mentioned, why not just get a rapid test now to "feel good", and then one more at the exact 3 month mark, as advised by most experts in this forum, to confirm (or rather, to dis-confirm) your fears?
All the best, and may God bless you. Lets pray for each other, alright?
reallyregret