Not Sure what to think?

Sorry if this is long.... On 01/27/10 I got my BFP after five years of ttc. Sadly our son didn't make it due to down syndrome I was 15 weeks when his heart stopped. I developed gestational diabetes very early on in the pregnancy. After the pregnancy hormone left my system my blood sugar returned to normal. My husband and I decided to wait until I had one full cycle before we would try again. The first cycle was a bust so I bought the clear blue easy fertility monitor figuring my cycles may be different after my loss. Recently I had to do a physical for work and my blood work showed I was pre diabetic. I never had problems with my blood sugar before my pregnancy. So they told me to monitor my blood and eat a low carb low sugar diet. The past two days I have been very fatigued and even threw up a couple times. I am 9 dpo so I decided to take a hpt it was late in the afternoon but sure enough with in seconds there was a faint positive which got a little darker before the 3 min mark. Could this really be it? I called my dr and have an appointment tuesday for blood work. I'm excited, scared, sad and happy all at the same time. I want so badly to be a mom but I am so worried that I will not go on to have a healthy pregnancy.