Overcoming fear

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Hey guys. I know this is nothing new to any of you but I just found out I’m pregnant with my rainbow baby and yesterday I was through the roof excited. Pure joy and everything. Today I’ve been gassy which means random pains and cramps (nothing like the miscarriage cramping I had before) but every time I feel even the slightest twinge my heart drops and I’m terrified. How do I get past this?