Hi @Siewli, it sure is a hard time. I remember the waiting and the anxiety of it all. It is so overwhelming especially at the beginning. So much to understand and learn too on a topic none of us ever thought we would have to deal with. @Zoffiel is right about not over thinking it.
Try to keep busy so you are distracted, do things you enjoy and spend time with people who are positive and supportive. If you think too far ahead you will only get anxious. Stay in the present moment. Thinking or over thinking is not going to change what test results.
Breast cancer is unique for everyone and everyone's treatment plan is different too. The thing is your drs need to have all the information to form the best path forward for you. Also just because a cancer is there awhile doesn't mean it is stage 4 at all. Could be slow growing. It is natural for humans to think the worst but the reality is that treatment is so good these days and improving all the time.
Hang in there. Sending positive vibes to you. We are here to support you when you get those results. Hope you have a good weekend.