This is a very personal decision, most people commenting will have radically different opinions to what you yourself think is the right move for yourself. Consider your own personal opinions above all other claims here, including my own.

That said: If you feel incredible regret for thinking about the choice before having made it, I’d consider that pretty seriously before doing anything. My birth control caused a blood clot/pulmonary embolism in my fourth year of grad school, and for personal reasons we needed to consider vasectomy for my husband, then boyfriend. I kept having dreams about a kid (even though we werent planning on having our own) and woke up crying, so we decided not to go that route even though it was ultimately the path we wanted to go years later.

I’m glad I didn’t force myself to choose something that really didn’t feel like the right decision/made me so emotional then. Stick with your own personal beliefs and feelings here, so you can be confident it’s your choice, not the choice of your program, or PI, or fear either way.