Hi I Am Currently Waiting For Results That I May

Hi I am currently waiting for results that I may be hiv positive. I have 3 year old who I am worried about . I know it’s hard to contract it to them but I have had a broken tooth for years. I know in early ears it use to belle some times. But Idk if it stil doesn’t now . If I do and I took a drink of straw and then my baby did right after is there a chance for transfer?