Pregnant after 2 blighted Ovums

I am 5 weeks pregnant after two blighted ovums in the last year. I am so happy but also so scared. My last MC was just this past December and broke my heart because I was told it was VERY unlikely to have more than one BO. I almost do not want to go in for an ultrasound because I'm afraid it will happen again. This time my progesterone is better and I have more symptoms. Anyone had multiple blighted ovums and/or MC and scared to death?