11 week old drank cows milk

Soooo my almost 11 week old daughter drank cows milk this morning about 20 mins ago and I’m kind of bugging out. My baby was laying on her play mat and my older son (15 months) had milk in his sippy cup. I was cutting up his breakfast and I turn around and see him holding his cup in her mouth! And she was sucking on it! I stopped him immediately, I don’t know how much she drank, or even if any. It’s a NUK sippy cup, so the top kind of looks like a nipple, but it’s anti spill so you have to suck pretty hard to get anything out of it, so I don’t even know if she was able to even get anything. I had my back turned for only a few seconds (just long enough to rip up a waffle) but I am concerned she did get some and she’s going to be sick. Waiting for doctor to call me back but that could take hours.

Please no harsh comments I already feel horrible 😔😔