Scared :( Please read

I have a cousin on my moms side that just found out 2 of her 3 boys have DMD. We have no known family history, My grandmas brother was fine and so are my 2 uncles on my moms side. My faternal twin sister had a carrier test and hers was negative but i did not have one and just found out im pregnant.

Im so terrified i failed and something will be wrong. Since we have no known history we were thinking it was spontaneous. Im sure the doc will check but my apt isnt for 2 weeks and i have such awful anxiety :'( Im not sure how to think.