Depends on your own complications. You could be suffering from other issues that are preventing pregnancy, such as endometriosis. Consult your doctor.
They say that if you haven't got pregnant after 18 months of trying go seek help.
Not normally, no.
The only pregnant women who routinely have shots are Rhesus negative women having Anti-D. Women who have had several miscarriages may have progesterone shots.
No rabbit normally needs shots. However, if you are showing your rabbit it could possibly need shots to be shown.
No. Absolutely Not.
It would be a good idea for your dogs shots to be done before she gets pregnant but just think though , Do dogs in the wild have shots before they have pups?
yes
Routine check-ups, and the vet will give you specific dates for shots to prevent aborting and worming medicine and supplements. The vet can give you more detail, but that is what you do when your horse is pregnant: check-ups and shots and you may alter their diet with special pregnant mare feed/supplements.
Yes you can. You need to continue your shots at your schedules increments.
By taking a pregnancy test
The American Academy of Allergies recommend pregnant women opt to use inhaled medications rather than oral medication. You can also consider allergy shots, if you already get them it is ok to continue these shots during pregnancy.
No, a rabies shot protects against rabies (atleast 99.9999% of the time).
Any dog can get parvo. To prevent it, go to the vet and get the shots are dog normally needs.