Are any of you worried you'll regret having children?

I am 22 years old and pregnant with my first child. Me and my husband tried to get pregnant, and we are both so happy to be expecting! Lately though, I have been worried I'll wish I waited or regret it. I am working on my Master's now and am planning to get my doctorate. I also wanted to travel. However, I felt that having a child is something I wanted now and I could figure out the rest later. However, people keep telling me how young I am and they wished they would have waited. So I am asking, do any of you regrets have children so early? And what can I do to truly enjoy this amazing time and not doubt because of the naysayers??