Is this normal?

So I tested today (11dpo) and got a Bfn. But I just now got a horrid wave of nausea! Like the sweaty, I’m gonna throw up any second, but never actually do, kind of nausea. I’ve experienced morning sickness before with previous pregnancy and it was exactly the same. Could I have gotten the bfn this lie king and start experiencing symptoms tonight? Or should I write this off as nothing and believe my negative?