I have a question about antibodies. I am awaiting a lung transplant and recently went off the pill for the first time in years. Surprisingly, I am still having sex with my boyfriend, but have been really really nervous about becoming pregnant. My main concern for getting pregnant is not just the obvious -- i would have to terminate the pregnancy, and its an all around bad situation for me right now -- but PRIMARILY i am concerned that I would develop antibodies that would then make me a more difficult match for transplant. I realized I don't understand enough about antibodies and pregnancy, and therein lies my question. 1- do all women develop antibodies from pregnancy? 2 - do the antibodies develop as a result of birth (mixing of fluids at that time)...or later in the pregnancy stage while the baby is still in the womb, or can it happen early on?

Basically I would like to know for peace of mind, even though it is unlikely, if, WORST CASE scenario, if i got pregnant and had to terminate the pregnancy early on...would I be at risk for developing antibodies that early? Or from the termination?

I should note that I had to terminate a pregnancy when i was younger (19) and never developed antibodies then.

I am very careful and use condoms + spermicide and all of that, but this is just me laying awake at night, worrying. Thank you .