Expert Q & A Answers About condom effectiveness HIV

How effective are condoms at reducing the risk of HIV?

I had sex with a prostitute two weeks ago. I used a condom, but I was wondering if there’s a chance that I’m infected with HIV? This was the first time I ever had sex. I don’t have a partner and I may have to rely on paid sex even in the future. If I use a condom every time, what are my chances of getting an STD?