Is it ok to bleach bottom teeth even though my gums are receding?

No , this would not help, bleaching will not work over the roots , that are exposed with receeding gums , thats why you see yellow below the enamel , peroxide will not work here , i suggest you should get instead veneers .

Hello and thank you for your question! Yes teeth can be whitened in the presence of recession however if is VERY important to do this at the dentists office where he/she can properly block out the receded areas that are exposed. This will protect the sensitive tissue from the hydrogen peroxide gel and light used. I would not recommend at home whitening or white strips.Good luck!