Probably a stupid thought, but... I'm scared that my breastmilk is making both the girls throw up

Amelia isn't really breastfeeding much anymore, but she's had two significant feeds in the past 24 hours and had a few massive vomits soon after both. The first was around 3ish this morning, she had a feed, a small sleep, then woke up by covering DH and herself in the contents of her stomach. She had a few smaller spews after that, fell asleep again around 7ish. When she woke up she seemed fine. Then about half an hour ago she had another big feed (emptied a very full breast) and threw everything back up again ten minutes ago.

Elisabeth has been a spewy bub from the beginning, but has only held down one feed today. She's also fed a lot less and has been very sleepy. I'm almost scared to wake her to feed her because I'm so sure I'll end up wearing it again...

Writing all this out is making me think that maybe they're both just sick from something else, but I don't want to ignore the possibility it's something in my milk... Is it possible?