is this normal?

So my af decided to show 2 days early and it's really light (doesn't reach pad) with brown and black. I put a tampon in before bed last night and when I took it out this morning it was brown blood and loads of black blood near the top? Had anyone had this before? 
My af used to start on 1st of every month but last month changed when started taking folic acid conception tablets.. ttc for 5 months