Anxiety!!!

Ok so I found out I was pregnant 3 days ago, I was over the moon and so excited, I couldn't wait to tell my fiance!! But last night I kept having nightmares that I'd lost the baby, that I wouldn't be able to cope when it's born, about people judging me, about now having ruined my life, that there will be complications... are these feelings normal or am I blowing it all out of proportion? please help!!!