Got an offer, have questions about sick leaves

Hi, I just got an offer for specialty customer representative role and I need some clarification on how and when I can use sick leaves. I may have to go through an IVF treatment in coming months and that’s why I want to know if it is possible to use sick leaves or PTO. I asked my recruiter but didn’t get clear answers. Can someone help me with this? I’m in Texas by the way. Also, do you think I should tell them about IVF and discuss options before joining?