Is this normal?

We just found out we're expecting our 2nd baby on Monday. 😍😍😍 Over the past month or so I'd get nauseous, not every day though, but since Monday I've had constant nausea and got sick a few times. Today, however, I've felt fine, no nausea whatsoever. I'm just wondering if this is normal? With my first pregnancy I was sick every day, all day for the first 3 months. I'm probably just being paranoid, but has anyone else experienced this?