BFP after mc in Jan 2015

I had a missed miscarriage in Jan, we found out at our 12 week scan. I ended up in hospital twice and finally a D&C. We really struggled to come to terms with it, it was our 1st pregnancy. I just got my bfp last week and I am so anxious. I want to be happy and excited but dread waiting for our 12 week scan. It feels so unfair that I feel this way.