I am sorry to hear you are in this position. Your partner needs lessons in prevention, public health, and common courtesy: she should have informed you of her HIV infection before getting sexually involved with you, not afterward. She also should have insisted on condom use.
Still, the chance you were infected is low. Her being on treatment does reduce the risk of transmission -- and even without treatment, the average risk of HIV transmission from an infected woman to her male partner is around one chance for every 2,000 episodes of vabinal sex. Kissing, "heavy petting", and performing oral sex on her were not significant risks -- only unprotected vaginal sex was of concern. The amount of lubrication or vaginal secretions made no difference.
Migraine is not a symptom of HIV and symptoms cannot start after only 3 days. The main symptoms of initial HIV infection are fever, sore throat, and sometimes swollen/enlarged lymph nodes (in several areas at once, such as armpits, neck, and groin), and sometimes a non-itchy skin rash covering most of the body. Pretty much identical to the symptoms of mononucleosis and other common viruses, so even if you get such symptoms, most likely it won't be HIV. As you already know, usually more than one of these symptoms occurs together. Typically they start 10-20 days after catching the virus.
You should immediately (within the next couple of days) see a health care provider who is familiar with HIV and then follow his or her advice about testing. Most likely, you can expect him or her to recommend standard antibody tests at about 4 weeks and 6-8 weeks (or maybe as long as 3 months) after the sexual exposure. Perhaps s/he will also suggest a PCR test to check for the virus itself. You also should be tested for other common STDs (gonorrhea, chlamydia, syphilis). In the meantime, try to relax. The odds you were infected are only one chance in many thousand.
Finally, although your partner behaved badly, there also are lessons for you. You should ask your partners about HIV and other STDs before having sex with them; and of course there is no excuse not to use condoms with new, casual sex partners.
Good luck-- HHH, MD
You may not start a new question; your repeat thread should have been a comment here . Also, please note the MedHelp rule about a maximum of 2 questions every 6 months in the moderated forums. The new one was your fourth and I deleted it.