Hang on, there are medical/pregnancy/wellbeing related threads on here all the time. That doesn't mean posters are not going to seek professional medical help as well as asking a question on a forum. I'm sure @SAgirl wouldn't use the experiences of others on a forum as a substitute for genuine medical advice.
When I am with my friends who have kids I'll often ask them questions, particularly about health and wellbeing, and attempt to gain a range of knowledge and experience to help me with questions I might ask a doctor, things I might look out for, etc. I value that, and for many of us we value that aspect of Bubhub in the absence of IRL opportunities.
Sometimes it's a way to seek reassurance after hours, or gain confidence in our instinct that something's not right. Some of us have many, many experiences of doctors not listening to our concerns, or dismissing us, and we want to gain some confidence that an issue isn't all in our head.
Others, like yourself, @J37, but also many many professionals on here may have some subject specific knowledge that can be a helpful starting point when we don't know where to start.