A prenatal vitamin should include B12, but since it is a key nutrient during pregnancy (contributing to fetal development, among other things), pregnant women who are vegan or have another reason to suspect a deficiency should talk to their doctor
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Medicines Certain medicines used for other conditions may affect the absorption of vitamin B12
However, this difference has no clinical significance
If you've had a BAD experience with B12 shots, it's most likely that you do not tolerate or convert cyanocobalamin well (see if you can verify what form of B12 was in the shot that made you react poorly, and then stay away from that specific form if you can)