Is it okay to supplement with formula while out?

Would it be ok if I supplemented with formula just while I'm in public? I want to EBF for at least 6 weeks, so no pumping. But if I need to go in public I really don't want to BF around people. I've been sexually assaulted in the past and I would personally feel too exposed and scared to do so..but I don't know if it's okay to use formula and breastfeed.

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