Blood type O-

Jane
I donated my blood this week for the first time. Just had an email informing me I'm O- I am suprised as this is one of the rare blood types and this prompted me to research on Google, as you do. 
So, I'm 26 and TTC with my husband who is o+ and I have read that if we had a baby with + blood that there could be complications with baby.
I'm freaking out, can any of you lovely people give further info, and put my over active imagination to rest? 
Thanks in advance!