Navigating first time pregnancy

I'm having a really hard time figuring out what is normal and what is not during pregnancy. I've been in a panic about every little ache and pain. I'm currently 10 weeks and have severe lower back pain and sharp cramps in my very low abdomen/pelvis area. The back pain has lasted about a month, but today it moved from the left side to the right.

I have my first ultrasound in 2 days, but I'm freaking out that I'm going to miscarry, or have a blighted ovum, or a million other horrible things.