Driving myself insane with worry

I had a miscarriage last month with my first child. My husband and I just found out we are expecting again! We are very excited but I'm also just so so worried. I suppose worry is just part of this process but it's so hard. Has anyone had a doctor tell them that it's ok to conceive immediately after miscarriage (before first menstration comes). I'm finding conflicting info on the internet. Some say it increases your chances of miscarriage again.