YOUR young husband could be infected with AIDS - and he could have passed on the deadly virus to the unborn baby you are carrying. Or it might be your schoolgirl friend who is infected - or you. That is the message two new AIDS advertisements will be hammering home from television screens each night from next week. The adverts are designed to shock people out of their complacency by making them realise that the killer disease does not distinguish between ''normal'' people and high-risk groups such as homosexuals and intravenous drug users. The idea - according to Dr Lee Shui-shan, head of the Department of Health's special preventive programme on AIDS - is to get people talking about AIDS. ''We want to provoke a certain degree of controversy,'' he said. The adverts are the first to be produced by a private advertising agency, McCann Erickson, which is charging only for costs. Dr Lee said this did not mean the department was unhappy with earlier commercials produced in-house by the Government Information Services Department; it just wanted a fresh perspective on the issue. McCann Erickson's managing director, Kingsley Smith, said the agency found there was a high degree of complacency over AIDS here, and deliberately steered clear of sensationalising the issue. ''We didn't want to alienate people. We wanted to draw people into the issue and not be able to say: 'That's not me','' he said. In one advert, a man receives a telephone call from a friend congratulating him on his soon-to-be fatherhood, as his heavily pregnant wife knits behind him. He then hears that his former girlfriend has AIDS. In the second advert, a schoolgirl doing her homework is shocked to learn that the ''cute'' boy she met at a party has AIDS. ''You didn't sleep with him, did you?'' cries her horrified friend. Dr Lee said he was expecting some controversy over the schoolgirl advert but said he was more concerned about ensuring teenagers could get help. Young people were deliberately targeted because of the international trend of more infections among them.