Lexapro while Breastfeeding

Anyone have any experience taking low dose lexapro while breastfeeding/pumping?

I'm 8 weeks PP and my OB/Gyn thinks I could really benefit from a low-dose SSRI, as my anxiety and OCD have been significantly increased since giving birth. I won't lie, I know that I'm at a point where medication might be needed soon, as I've been experiencing a serious uptick of intrusive thoughts and cleaning compulsions.

However, when I went to the pharmacy, the pharmacist expressed some concern about the medication passing through the breastmilk. Even though it's technically deemed safe-ish, I'm terrified of the thought that my baby's neurotransmitters could also be affected, especially in such a vulnerable time of brain development. The pediatrician said that they are ok with the medication because the benefits of improved mood/symptoms in the mother outweigh the risks to the baby. But I feel like I have to choose...

If I take the lexapro, I'm not sure I'll be comfortable enough to continue breastfeeding. After working so hard to establish my supply (just enougher), I really wanted to make it to 6 months. But I don't know if it's worth going unmedicated for another 4 months. I'm just so sad to think that this could be the end of my journey... it makes me not want to take the medication.

ETA: After reading people's comments and experiences, I realized the fears I have about the medication are likely part of my OCD and anxiety acting up. I tend to get obsessive and intrusive thoughts about this stuff, so it makes sense that I feel so nervous to start the medication. But ultimately, maybe that's a sign that I need to give it a try so I can stop being so paranoid and anxious about everything!