Scared about baby #2

I’m in the very early stages of the first trimester with our second baby. I’m beyond happy that I’m pregnant again, but of course now I’m constantly afraid that something bad will happen to him/her because it took a much longer time for us to conceive our first. It’s like I can’t believe I could be this lucky. I’m trying not to stress since I know that isn’t healthy for my body or the baby but then I stress about not being able to relax! I also have a toddler and when I’m with him I act normal - lifting him, carrying him, wrestling with him - and then when it’s over I remember I am pregnant and then I worry I should have been more gentle with my body. Any tips for how to stop worrying so much??