Scared of not conceiving

Kristin • 27 married army 2 girls ( 3 & 8 ) expecting our 3rd and final princess. recent miscarriage (04/24) we found out our rainbow is due 02/13/18 :)
For once in my life in scared that I won't be able to conceive my 3rd child. My oldest daughter was a high school ugh oh but she actually became my hero she's changed me in so many ways. My second daughter was planned but we had a bumpy road from conceiving to 3 months pregnant. And exactly 2 years ago we lost our angel early and it still hurt my heart. We have been trying for two weeks now and my cycle starts on the 17th. I'm praying I won't have it lol just wanted to share how I'm feeling today because we took a test and came back negative. Not giving up but trying not to break down.