Pregnant?

Hey guys, I am new to discussion and I need your help!

I usually do not spot before periods but I have had light pink spotting very very light only when wiping for 2 days and one day heavy and now it is back to very light pink when I wipe. I have also had stretchy cm which I never ever got before. Could this be implantation? This is my first time ttc. My period was supposed to come this week but it hasn't showed up yet. 😁 Also, my periods are usually very heavy from the very beginning, it seems very odd to me. I have no other symptoms yet. But I have read that implantation only lasts for about a day. I'm so confused. 😐 TIA