3rd pregnancy after 2 miscarriages

Samantha
So I was in denial for about a week after experiencing my usual pregnancy symptoms and I finally took a test today and it came back positive. Since I was so devastated after losing the first and second one I can't let myself get excited. I obviously am but I am so beyond scared to lose this one too I can't even help but  be sad. 
this is my 3rd pregnancy in 3 months. No we didn't try but we also didn't prevent a thing. 
If any of you ladies have any advice or any helpful words. Or if anyone that has had a miscarriage has anything that they would like to tell me that would be wonderful.