Found out I have RH negative blood

So my doctor called and said I have RH negative blood and that if I bleed at all during this pregnancy or if I have a fall and hit my stomach I need to get a shot immediately. I also have to get a shot at 28 weeks as well just to release antibodies in me.

This is concerning but if anyone else deals with this. Was it hard to deal with and I am scared of sitting down to fast or getting up and bumping my tummy. I’m only 12 weeks but just scared it could become something worse if I bump my tummy accidentally somehow. I rather just get the shot now to be on the safe side.

Any advice would be greatly appreciated