"I can't do this..." "I can do this!"

La
I am going to be a ftm, and a single mom. Some moments I think "what the hell am I doing? I can't have this baby. I can't do this alone... what am I gonna do? What am I thinking?!" 
Other moments I tell myself I can do this. That others have gone through worse with a lot less and overcame...
Am I normal for feeling this way right now?