Oh my goodness I'd be ballistic with my vet if this happened. For multiple reasons.
>We didnt realise we had missed her yearly booster, so started a fresh course. First vaccine given on 3/12. This is a working gundog, when further covid lockdown was announced and an end to the shooting season we decided to mate her. Mated on 17/12, second booster now due. Vet advised to go ahead, second vaccine given on 20/12.
Point one:
You do NOT need to restart boosters just because you miss one!!! That is total BS and a money-making scam by vets. A dog needs just one vaccination a year if they have been previously vaccinated and if you miss a year or even two or three years, a single vaccination is all that is required. Two vaccinations are only needed for the initial course. Vaccine amnesties just make zero sense immunologically speaking. You would only need to give an adult dog two vaccines if the dog's vaccine history is unknown and there's a chance the dog might be a stray and previously unvaccinated.
Point two:
Your vet had clear advice in the data sheet that vaccines should not be given during pregnancy. Whether one of them or two.
Vets like this make me sick. I would seriously email them the data sheet from Noah Compendium online and request a refund for your two vaccinations at the very least.
As it was so early on in pregnancy, my guess is that the pups will be ok in terms of development because they are well-protected from environmental toxins until they attach - and they won't have done that 3 days after mating. But as Brainless says, the pups are going to end up with longlasting antibodies as a result of this vaccination so if new owners give pups vaccines at 8wks and 10wks or even 8wks and 12wks, they are unlikely to be protected. New owners should be advised to delay the final vaccination until 18-20wks.
For future record, your dogs do not need a vaccination of anything every year. They need just ONE DHP vaccination at a time when maternal antibodies have worn off, and they are protected for life. If you want them vaccinated for Lepto and parainfluenza and KC as well, then they will need those annually - but those are not core vaccinations. My own dogs don't get them and never have done, pregnant or not.