I am so sorry you are having so much trouble with this issue that your therapist is able to get pregnant and have a baby. I know its hard to know one or the other in a relationship is unable to do what comes naturally for another. especially when its been a life long dream.
you cant control whether your therapist expands her family and when and how. but there are things you can do for you.
have you thought about adoption. there are so many children in this world in need of families, parents. sure you wouldnt be birthing them through your body complete with the pain, stress, weight gain, morning sickness, nor the hours of labor, nor the joys of pregnancy but adopted children are your children to love and nurture all their lives just like any other child. taking care of and loving a child is no different whether they come from your body or someone elses.
for adoption its relatively easy. you become a foster parent, take classes with department of childrens services and after they have done a background check on your home and family they place a foster child in your care. you love and nurture that child throughout the process of their being placed in your home first as a foster and then as the case turns towards adoption and then through the adoption. if you let the caseworker know that you only want to foster children that are adoptable they will only place children in your home who are going through the termination of parental rights and adoption process, not the reunification with bio parent process.
have you thought about IVF? thats where parents first go though physicals to see where the reproductive problem is. sometimes the problem areas can be corrected with diet exercise, and other options too.
sometimes the problem areas are happening in /for both in the relationship, sometimes its one or the other, sometimes a couple trying to have a baby are just unable to get the cycle timing correct.
getting cycles to match is quite hard because the egg viability is different than its male counterpart. and theres only a three day span each month where conception can happen. even with those with no reproductive issues.
anyway, in IVF the mother is implanted with fertilized eggs (fertilized either from both in the relationship or through donors) and like normal carries that fetus and give birth to the baby. again, caring and loving and nurturing an IVF child is no different than having a child nature's way.
you know you cant control what your therapist does with her body, she doesnt even have to disclose to you whether she is planning or not planning a pregnancy. that's all part of this thing called right to choose. and reproductive rights many women are fighting for now
women should always have a right to their own bodies, what happens to them/ with and for their bodies including their reproduction rights.
if you really want to have a baby there are ways you can have a baby. talk with your doctors and husband (or wife) and just decide which route is best for you.
then work towards that. some ways take longer than others but in todays world its not an impossibility anymore like say 50 years ago. you just need to find the route that works for your body and family.
good luck and please try to understand that your T having a baby is about her body and her own reproduction rights. Im sorry that this is a problem for you because of your history but it really is her own reproduction rights.
maybe its time to let this T go since you and this T seem to constantly have problems. (evidenced by your posting history) and find a therapist who will have stronger boundaries on what they share with you about their personal life and body.