How to whiten teeth

I brush my teeth twice a day everyday and try take care of them the best that I can, I try not drink much sugary stuff and I go to the dentist regularly but my teeth are just more and more yellow tinted and with the virus I can’t get them whitened at the dentist surgery. It has such a huge impact on my self esteem to the point that I am so insecure smiling. Is there any ways to whiten my teeth? I’m also pregnant so it would need to be pregnancy safe.