My cat peeing in the bed

[Barry DeMars]

Hello my cat sasha has started peein in our bed on my side of the bed. This seems to only happen when she is in heat. but being disabled and on a fixed income that barely keeps my head above water. I am unable to get in touch with a vet to have her checked to rule out a uti. but I don't believe that is what the problem is. Cause of where she pees on the bed I think she is marking. she pees right where my hips are. no where else. otherwise she uses the cat box. and yes it is cleaned daily. As I can not afford to replace my bed and this issue only arises durring her times she has been in heat.
Other than having her spayed, which will happen real soon here what else can I do to stop this from happening?