Rhesus negative and pregnant with 2nd baby.

Frankie
I'm rhesus negative blood type. Had a daughter 7 years ago and had a jab in my leg then for something to do with my blood type for if I had a baby again in the future. To be honest I didn't pay too much attention at the time. 
I am now 10 weeks pregnant and keep getting myself worried as have heard being Rhesus negative with a second pregnancy can be problematic. 
Can I have people's honest stories where this has happened to you and what happened if anything? 
Thanks all