Hiya,
Well i reckon you really should just get yourself checked, call your midwife and tell her and see what she suggests.
It could of been just a bit of a darker discharge, that against your underwear looked pinky. But you are only 25 weeks, so you need to get checked, as if it was ( which i doubt ) a show, you are very early, and if they catch the on-set of prem labour they can stop it.
Like i said, prob nothing to worry about, maybe just a bit of a infection.
Just get ya self checked, and congrats! Do you know what you are having
Take care
