Uy, this is really something you need to check with your OB right away, lalo na may threatened preterm labor ka na, don't wait on this one, mama. Watery discharge dapat i-assess agad ng doctor mo, especially with your condition, para ma-rule out kung normal lang or something else. Since naka-Heragest ka na, your doctor is already monitoring you closely, kaya sila lang talaga ang makakasabi if this is just part of pregnancy or needs attention. One of my mum friends nag-panic din with discharge changes during high-risk pregnancy, pero OK lang siya after the OB checked, so go and get peace of mind din. You're doing great by being watchful, but let the expert look at this one, ha?