I do agree that you should read books, or even just information here on Parenting about what to expect during your pregnancy. There is a lot to learn, and reading up will answer a lot of your questions. Miscarriage is a common worry. Just know that it is completely out of your control, and if it does happen, it is absolutely not your fault.However, you do not need to worry about laying on your back until much later on in your pregnancy. Until your baby is much larger, it won't put pressure on blood vessels. If you have a hard time sleeping on your side, you should start getting used to it. But really, as long as you're comfortable, you're fine. Once your baby is bigger you will probably find it uncomfortable to lie on your back, and that's when you need to worry about staying off of it. But, with all three of my pregnancies I would wake up on my back in the middle of the night, mainly because I got extremely uncomfortable while sleeping. It never did my babies any harm. So don't freak out about that.Really, don't worry too much. Be healthy and things will be fine. You are not guaranteed to have any pregnancy symptoms, it's different for every woman. Just take things one day at a time. And if you need to talk, you can message me here, or I can give you my email address. I've been through it all three times.