Hard to believe I'm pregnant?

Did anyone/does anyone struggle with this?

It's kind of like...I got the positive pregnancy test, I got the doubling HCG level. Nurse says things look good...I guess it's because I have mild symptoms (only occasional nausea, sore breats come and go, I'm tired all the time but not like falling asleep, no real cravings yet, etc lol) and I dont feel it/don't have a bump since I'm not that far along, naturally...and I won't have my first ultrasound until March 9th. So I won't know what's going on in there until then.

Maybe its cause I'm afraid to get attached and something go wrong...but it's just hard to believe something is actually going on inside me?? Ugh lol