I'm obsessed i may miscarry,what can i do?

I am 4.5 weeks pregnant but i am obsessed with miscarrying,this is my first pregnancy so it hasn't previously happened me but every morning i check my underwear for blood and any runny sensation i have i'm running to the toilet to check.It's a real fear and i'm afraid of stressing myself out and causing a miscarriage.I was diagnosed with a cyst on my ovaries 6 weeks before i feel pregnant and now have slight twinges in the same place,i know i'm probably right in thinking that it that that is causing the slight discomfort on one side bu i'm terrified of miscarrying,how could i get over this fear??