
Not daft at all!
The one thing I would add is I would never allow my bitch to swim during pregnancy due to the risk of infection. I don't know how true this is, but I didn't want to risk it, so never let her swim (something she LOVES), so no walks near to water just in case.
Of course, we can do plenty of lead walking with our bitches, but mine would be positively depressed if she never got off lead. I just used to make sure my big male (very clumbsy & physical play!) was on lead when she was let off to avoid the risk of accidents.
As for a pregnant bitch being attacked, I would definitely be wary of strange dogs, and perhaps put her on lead, but they probably smell "different" to other dogs, therefore increasing the risk of being picked on. My bitch is very quiet during pregnancy, I don't know what other bitches are like.