Pink discharge on pad 23 wks

So a little over a week ago I was having a crazy amount of Braxton Hicks, so I took it really easy for the weekend. Since then, there is a pink tinged area on my pad every night (I wear them all the time to help with discharge and bladder) and almost every morning. I change it before bed and after waking up. With my first pregnancy I only had this happen the day or two after intercourse, but this one persists even without. There’s never any pink on the toilet paper when I wipe, though, which is perplexing. I guess I’m not overly concerned, just perplexed. Anyone know what this is about? Photo is very close to true color.