Ay, that's getting close na talaga! At 37 weeks and 5 days, you're basically at term na, so losing your mucus plug is actually a normal sign na your body is preparing for labor, but it doesn't mean you're going into labor right away, ha, kaya don't panic. A few of us mums experienced the same thing and some of us still waited weeks pa before actual labor kicked in, so it really varies. Just keep an eye out for other signs like regular contractions or your water breaking, and definitely call your OB or go to the hospital kung may anything else na unusual or kung you're worried about anything, better safe than sorry, especially na malapit na talaga. You're almost there mama, stay positive!