Help please!

I was due to start my period yesterday according to Glow. My cycles are all long usually and are slightly longer after my miscarriage in November. Yesterday on the day I was due I had brown strigy type discharge (sorry, tmi!). Today, slightly heavier but still not red blood as I would expect at the start of a period. It's more the type of blood it ends with. Any ideas would be greatly appreciated. Feel a bit worried 😔