Hello,
Welcome to HCM.
Although your query is little difficult to understand, I assume you had sexual contact with a female sex worker. You had used condom during intercourse and now you are concerned about possibility of
HIV infection.
You said that you have developed an ulcer but havn't written the site. I assume that you have developed it on penis.
As you have developed it very next day, it must not be due to any sexually transmitted diseases as all
STD will take some time before any symptoms can develop. Most likely reason for this is abrasion due to forceful intercourse or wrong usage of condom. If it is the case, it should heal by itself in a few days.
You told that you both has came HIV negative. And you had used condom during intercourse, so your chances of getting HIV is almost nil. Liking breast is also not a know way by which HIV can spread.
But still I would advise you to repeat the test after 3 months. If still it is negative than you need not worry at all.
Hope this will be helpful.
Do ask if any further question is there.
Take care.