Quoting jen black:" My bf begged me to get one. Said he'd do anything for me if I get it. He said he'd leave. So I'm like smurf you. And we are now getting ready to raise number two. No one can make you do smurf."
Something similar happened to me. My fiance begged me to abort, and also threatened to leave. Said it would kill our relationship. and now he kisses/talks to my belly. He couldn't be happier.
OP if someone forces you to abort whether its a parent or partner, resentment after is pretty common.
If you abort, it should be your choice. No one should force your hand IMO.
Best of luck.