Help!!!!

So I’m 10dpo today, did s test which came out negative.

Af is due on Monday but couple hrs after testing I see light pinkish blood and cramping.

Don’t know what to make if it as I’ve never been actually actively ttc before. All 4 pregnancy just happened and tests came back positive never gave a second thought about it. My 4th ended in a mmc so this time I’m more scared it won’t happen. I’ve been observing my cycle. Used opk tests to check when I ovulated and counting down the days.

This is the first month trying but scared it won’t happen as I’m 43 and feel time has run out.

Could this be implantation bleed or Af showing up 5 days early??