Hello This is a very confusing situation , as your penis was inside his anus ( only head ) , you had sexual intercourse ( anal ) with protection ( condom ) . But when your glans was inside his anus , this is a cause of concern . HIV has been demonstrated in the seminal fluid ( I didn t say semen but seminal fluid , a fluid secretes from urethral opening due to excitement before ejaculation )but if there is urethritis and /or epididymitis , there is increase in the concentration of HIV. Now something about anal intercourse or ( head of penis in anus ). There is a stron association of transmission of HIV with receptive anal intercourse, probably because only a thin, fragile RECTAL mucous membrane separates the deposited semen from potentially susceptible cells in and beneath the mucosa and a trauma may be associated with anal intercourse. Anal douching and sexual practices ( may be in your case , strongly ) that traumatize the rectal mucosa increase the likelihood of HIV infection ( in your case , since head of penis was inside anus , so you were at risk). Antibodies to HIV begin to appear within 2 weeks of initial infection ( contract ). So I recommend you get in rapid P 24 NUCLEIC ACID AMPLIFICATION ( pcr , rna ) test for HIV infection confirmation. Hope this will help you.