How do you know dilation and effacement so early?

💗 ✨

Just wondering how so many people know their dilation and effacement already? Are you having internal exams or is it through ultrasound?

I'm in Aus, and the standard (if no complications I assume) is no internal exams until labour starts

I didn't have any with my first - but now I'm curious what I would be with my second as having painful BH already at 33 weeks!

Thanks ☺️