If it was a regurg, there is no way your nose would be able to stand sifting through it!

Sometimes they just poop out big globs of hair. Its normal. I am willing to bet that the first "regurg" was also just poop.

You would be able to tell if it was a regurg. The smell, what it looks like. Its unmistakable once you see/smell it.

Generally, regurgitation happens 1-2 days after feeding. After that, the food is no longer in the stomach and can't really be regurgitated..