Same Sex Pregnancy

For those who are in a same sex relationship (female), how do you decide which one of you gets to be pregnant? Do you alternate and take turns being pregnant? Or does the same person get to be pregnant every pregnancy? I am genuinely curious, so please do not be offended by my question. I apologize if I offended someone. I'm a heterosexual female, just wanted to learn something about someone else and not be ignorant. I love learning about others. ❤️