I am lovely, I think you are coming across as pretty insensitive though, as well as lacking in knowledge about the subject. Google is your friend.
It’s not the olden days any more. Science has moved on. Back then people died of things they didn’t need to. Miscarriage was seen as ‘one of those things’, to be never mentioned.
You clearly aren’t an early pregnancy specialist. Due to modern medicine, these specialists have been able to identify a number of conditions that are linked to ‘chemical pregnancies’ as they prevent the egg implanting properly.
Things like NK cells. Vitamin deficiency (vitamin D and B to be specific). Some of these underlying causes are potentially dangerous to the women - antiphospholipid syndrome (which I have, thankfully identified due to the availability of early pregnancy testing) can prevent the egg implanting securely, and lead to early miscarriage (as well as later miscarriage and issuws throughout pregnancy) but is treatable once diagnosed so more women than not will have a successful pregnancy after diagnosis. it’s also a leading cause of heart attack and stroke in women under 50. Pretty important to get this identified and the main reason this gets identified is because women have recurrent pregnancy loss - often early. ‘Back in the day’ you talk about, this wasn’t a known condition. The pregnancy losses that characterise it were a big factor in identifying this incredible dangerous illness that causes clots, heart attacks or strokes in around 1/3 of the people who have it.
Thyroid problems can also cause early miscarriage. Again, important to identify.
Early pregnancy loss would just have been unexplained infertility back then. You need to know you are getting pregnant in order to investigate why these pregnancies are failing.
3 miscarriages is the magic number to being referred to a clinic for investigations. It doesn’t matter how early these miscarriages are. One miscarriage is often isolated. There’s still a medical cause. 2 is a bit of a warning as a higher number of women who have had 2 miscarriages will go on to have a third. Many countries start investigations after 2. The uk wants 3 because that when they feel there is a pattern. Imagine how many opportunities would be lost without this early testing?
I think it’s amazing that we live in a time where we do understand so much about pregnancy loss. Each little scientific breakthrough might end someone’s misery. That starts with early investigation.