Very sick! Is this normal?

Jaclyn • I`m 28 and my husband and I have an 18 month old little boy. We have decided to try to expand our family.
I am almost 7 weeks pregnant and I have been very sick for a few days now. I have been throwing up a lot! When I was pregnant with my first baby I don't remember being this sick so early. Is this normal? I'm worried something may be wrong.