Ay, mahirap sabihin talaga based sa description lang, mama! Best pa rin na i-check mo agad with your OB para sigurado, kasi baka mucus plug na, or could be just normal discharge (happened din sa akin around that time and parang paranoid lang ako haha). A few of us mums agree na if it's stringy, thick, and maybe a bit pinkish or brownish, mas likely na mucus plug na, pero honestly ang safest is to message your doctor or go in para ma-examine properly, lalo na at 38 weeks ka na, you're so close!