“?Period?” After 4 days late??

Ok ladies. I have a few questions.

First of all my period is always on time, and last week I was supposed to start my period on February 28th and I happened to be 4 days late so I took a test on 2 days late and it was negative. I’ve been having some early pregnancy symptoms such as nausea, headaches, very heightened sense of smell (some smells repulsive that I usually like/don’t mind) and SEVERE heartburn, peeing very frequently, and extremely tired. So Anyway I decided to wait a little longer to test again.

Well my “period” if that’s what you would even call it came on March 3rd around 3pm. When I usually start my period first thing in the AM. A few other things. It started off as spotting dark brownish/copper color then got a liiiiittle heavyISH. not like my normal period at all. And I didn’t even have any of my period symptoms I usually do (sore breasts, cramps, etc.) Then turned into a pinkish/bright red and only lasted 2 days. The 3rd day (today) is VERY occasional darn brown spotting. Almost like what I get at the end of my period. Not even worth a tampon so I’ve been wearing a liner. Which I never do because I’m usually pretty heavy.

ANYWAYS

I’m very confused because my period usually last like 7 days including that ending left over blood. So, my questions are, has this happened to anyone and did you end up pregnant? ALSO is it possible to have implantation bleeding after my missed period?? I need so input on this weird coincidence as this has never happened to me. Not even with my first pregnancy.

Thanks in advance!!