At home elders never really encouraged star fruit during this time. I just went with the usual fruits and felt fine. But for anything you are unsure about, your doctor's word is the best one to follow.
Honestly there are so many easy and cheap fruits that are clearly safe, like banana and apple. Why spend on a fruit you are unsure about. I kept it simple and saved the worry and the money.
I had gestational diabetes so I was careful with all fruits. Honestly star fruit is not something I would have without asking, especially because of kidney concerns I had heard. Please check with your gynac before adding it.
Star fruit is a bit of a question mark, some say better to avoid it especially if any kidney issue. I would not take a chance during pregnancy. Safest is to confirm with your own doctor for your case.
Beta star fruit is not something we commonly gave in our family during pregnancy. We mostly stuck to known fruits like apple, pomegranate, seasonal ones. If you really want to try, just ask your doctor once na.