Masturbating at 25 weeks

I never used to masturbate and now that I'm 25 weeks pregnant I feel like I have to in order to relieve stress because my belly is big and I get scared of hurting the baby during sex.  I feel so guilty even tho I'm not watching porn or anything I just feel like really sad that I'm not getting those feelings from my love. I'm doing these things behind closed doors for selfish reasons. Makes me so emotional. 😞