Advice really needed please I'm confused!

Hi ladies

I would really appreciate any kind of advice......

My last period was 18th of April, all normal...my cycles are normally between 22-27 days, I started metformin just after my last period and was due to have a blood test between day 2-5 of my next cycle......and I still haven't come on??? Although Wednesday I went to the loo, wiped and had 3 spots of pinky watery discharge thought oh period put a pad on but nothing, then yesterday same went loo, wiped and the blood was much more prominent in colour and thickness, done the same thing but the pad completely clear and nothing since even when I am going to the loo, absolutely nothing.

I have done 2 hot but negative. I'm just confused what this could be hence I don't want to miss the blood test due to mucking up my days......

Thanks ladies

Emma xxx