Hey mama, normal lang yan most of the time during pregnancy dahil sa hormonal changes, marami sa amin experienced the same thing, especially around mid-pregnancy like you! But since may slight discoloration siya at gusto mo maging sure, better check with your OB just to rule out any infection, especially since you're 25 weeks na and mas importante pa rin to monitor ngayon. As long as walang strong odor, itching, o cramping kasama, you're likely okay, pero peace of mind is worth the checkup talaga. How are you feeling otherwise?