Scared

We just found out last week that I am pregnant with our rainbow 🌈 baby. I am about 5 weeks. I have been taking test every few days. We lost our last one really late at 35 weeks. It took a lot out of me. I am happy that I am pregnant again 3 1/2 years later, but I am scared that we may loose this one too. The tests aren't getting darker. I am trying to stay positive but it isn't easy. Any one been through something like this and still have a healthy pregnancy?