Pregnant. Not feeling like a Mom

I had a preterm delivery in 2014 at 24 weeks, baby didn't survive. Then I had a miscarriage last year at 12 weeks. I'm currently 18 weeks and 6 days pregnant. With my history, it hasn't hit me that I'm going to be a mom. I won't believe it until my baby is in my arms healthy and breathing.I haven't even told my family yet because I am scared something will go wrong. I don't even know when/if I should start shopping for things for this baby. I love being pregnant but I'm not sure if I will actually get to be a mom this time around. Anyone else feel like this?