"My body, my choice" always comes with the caveat "unless it hurts other people". The big examples (that some have already pointed out) are knowingly spreading disease, late term abortions and just physical harm to other individuals in general. They would argue that it's not only just physical harm though, mental harm is just as bad if not worse and generally they believe suicide is mentally harmful (and sometimes physically) to everybody around it. Imo, it's kinda fucked they want to force us to live just so others don't feel worse but
just my take. It's essentially keeping us poisoner and forcing us to endure mental/physical torture for the overall health of society. This is also why a lot of ppl say suicide is selfish, which it is but realistically everybody is selfish and prioritizes their own wants, being "selfish" isn't a negative thing. sorry for the mini rant lmao.
If we're being extremely uncharitable we could believe that they actually want individuals to do whatever they want with their body to anybody with no consequences. But realistically they don't want individuals to hurt others and they want there to be consequences when people do hurt others. This is also why I said it ultimately comes down to them not seeing fetuses as humans because if they did, they'd obviously be against abortion.