Can Someone Help Me... I Had A D & C

Can someone help me...
I had a D & C
and i had my menstruation last month on the 27 of may...
I had unprotected sex last night with my husband at 8 pm.
Didin't check if I was ovulating.. They analyse my tissue and I had a Partial mole this is why my baby died inside of me... the news came up this morning... same time I RUSH to the pharmacy to get PLAN B... I weight approximately 180....I don't know what to do i took plan be at 12h39 pm. today ... Is it going to work... and my husband went for a vasectomie on the may 20.... and i give him blow job 3 to 4 times a day everyday... they say after 20 ejaculating there wont be any sperm left in the testicules... .....
Ummm Im scared I don't want to be pregnant and risk my life on getting cancer...
I want to know is it accurate will it work... i know chances are lower because he got fixed but i didint risk it....
someone help me please anxiety and stress right now....