First scan

I had a miscarriage in May last year, and been trying to conceive since. Anyway I found out I'm pregnant and my first scan is tomorrow 8 weeks.
I'm so nervous because I went for my 12 week scan last year and I got told there was no heartbeat which destroyed me and my boyfriend.
This pregnancy has been so different to the last iv had a lot more symptoms I'm feeling very positive but can't help but worry!!!
Anyone else had this happen to them?