Worried

I just found out I was pregnant a week ago and doctor confirmed it with a urine sample the same day but everyday I get worried I’m gonna miscarry. This is my first time being pregnant so it’s still a bit of a shock to me like it still feels like a dream come true. Every time I use the bathroom I always check my underwear for blood especially after my morning sickness stopped. The only thing I got to go off of now is my boobs constantly being sour. Anyone else go thru this? My husband says I’m worrying myself too much and everything is fine.