Because pregnancy is not a communicable disease and mask mandates were never punishable, making them more or less suggestions for public health.

Nobody got arrested or forced to take a vaccine. Anybody who tells you different is lying to you (at least in the US, I'll assume we're talking about the US since that's where abortions were recently outlawed). What arrests that took place we're for disorderly conduct type charges by not respecting private property and harassing or accosting people in public who chose to comply with the mandates.