Ay, mama, that sounds like it could be your mucus plug, especially if it's thick and stringy, sometimes with a bit of blood, but honestly, better to call your OB right away to confirm kasi bawat mama different ang discharge nila! A few of my mum friends had spotting and cramping days before labor, while isa naman ay biglang parang gush ng fluid, so hindi talaga kami sure-sure kung ano ba talaga unless the doctor checks; definitely don't worry too much pero get that checked ASAP para sure na okay lang baby mo at ikaw.