Without trying to run straight at an argument, putting forward that she may have been pregnant as a theory seems a little weird.
There's a difference between a theory based on 'DS posted this on SM which leads me to believe there's a possibility she was pregnant' or 'She was posting pins on Pinterest that could be to do with this, but could they possibly be because she was pregnant?' than straight up out of nowhere putting it forward as a theory. I mean, if we go down that route, we could start all sorts of theories that lead us down unhelpful avenues.
'Perhaps she was secretly gay and when she came out, someone didn't like it'
'Perhaps she was unknowingly ill and found out that day and walked off...'
As valid as those scenarios could be, I feel like it could be quite damaging to go down the route of them as theories without
any sort of indication towards them being factual. Suppose the pregnancy theory gains legs and then on SM someone says they've heard she may have been pregnant and then full circle we are discussing how it looks as though she may have been pregnant.
I don't dismiss the theory as being possible at all, it's definitely possible - as it is possible for most females to be pregnant at any one time. But without there being any basis for thinking she may have been, I feel like it could do more damage than good to be discussing it as a particular, individual theory. Just my opinion, please don't tell me off!