2 miscarriages- now 4 weeks pregnant and scared to death!

Pregnancy #1- Success
I have a 2 year old daughter and my pregnancy with her was a breeze. 
Pregnancy #2 - Miscarriage 
Back in September I found out I was pregnant with our 2nd and I ended up losing the baby at 11 weeks in November...to say we were heartbroken and devastated would be an understatement. I did have a hematoma which caused bleeding but the miscarriage was very unexpected even from the doctors. They said we could try again once we were ready...
Pregnancy #3 - Miscarriage 
I got pregnant early January after my second cycle following the miscarriage. I was convinced the first miscarriage was just terrible luck and everything would be okay this time. At 8 weeks I lost the baby... This time I got a D&C because I couldn't imagine going through the process naturally again with the constant reminder. I had them do genetic testing for abnormalities, everything came back normal. They said we could try again once we were ready...
Pregnancy #4 --Praying this one will stick!
I got pregnant early April right after my first cycle. I took a test yesterday and couldn't believe it! I want to be excited but it's so hard and part of me doesn't want to get my hopes up again. I am now 4 weeks 4 days. I called the doctor and this go around I will try a progesterone suppository. 
Has anyone ever gone through anything like this and have any recommendations for me? I am nervous that i got pregnant after 1 cycle and hoping it does not decrease my odds.