8 weeks pregnant and sickness is gone...

Hey ladies! So as of today I am 8 weeks pregnant. First pregnancy ever! Last week I started feeling very nauseous all day and actually got sick a few times! It lasted about 4 days.. now I feel nothing! It just went away. Should I be concerned or is that normal? I've never had an Ultra sound only blood work done , my appt isn't until I'm 12 weeks and that's when they will check the baby's heartbeat. Any answers are appreciate ❤