PPD and Sex

Jessi • Expecting baby #1 September 2015!
I'm 16 weeks pp and have been taking Zoloft for PPD since week 3. I had a 3rd degree tear and it caused some major discomfort for sex after baby. It's been almost 4 months and my husband and I have only had sex twice. It just sounds horrible to me. I returned to work after 6 weeks and I have been very busy (hs teacher with multiple extracurriculars). Today DH was very upset I didn't want to have sex. I just am not in the mood... I do take care of him sexually in other ways but it doesn't seem enough for him anymore. Please tell me I'm not alone.