I had a show, kept worrying if I'd missed it as I was overdue but when I saw it I wouldn't have mistaken it for anything else IYKWIM.
It was a blob (spoonful?) of whiteish jelly with a streak of blood, contractions started later that evening and that was it (well, that was the start of 3 days slow labour at home but that was the start properly).
Could be your mucus plug. I lost mine about 9 days before labour started. Was a jellyish snotty thing. But then had an unmistakable bloody show on the day labour actually started. Which was more like lots of clear mucus all streaked with blood.
3-4 days before labour I had lots of plug come away. Probably about three good handfuls best described as looking like the gelatine in a porkpie. Then I had a bloody show about 1 hour before I actually gave birth. That was a big clear blob streaked with lots of blood.
Mine was like pale orange jelly/snot and came away gradually over the course of a day, then when I was 4cm dilated and they admitted me the MW did a sweep to help me along a bit more (I'd been in labour 26hrs by that point and his head hadn't even engaged yet). About 20 minutes later I felt something sort of slip out (TMI, sorry!), went to the loo and had a huge blob of pale pinkish goo with a streak of blood in it.
Mine was about a spoonful of gelatinus goo, a little streaked with blood on the Sunday afternoon. Waters broke Sunday night, contractions started Monday morning and DD forceped outta there on Wednesday morning.
I know it is quite possible to have days between a show and labour but hopefully this is the start for you. Good luck!!