Implantation bleeding?

Hi ladies! I am a sexually active 20 year old and honestly have no idea what hardly anything is when it comes to sex. While I attended my elementary-high school’s sex ed classes, they mostly preached about abusive relationship and STDs, but nothing on periods or pregnancy or actual sex. So I feel EXTREMELY clueless!

Anyways, I have an IUD since my periods had gotten so awful and because I felt so paranoid because I couldn’t always take my pill at the exact same time.

So let’s get to the point. My period was due this past Wednesday. Okay cool I was just thankful it was due before Independence Day. I ended up having sex this past Sunday (not today). We used condoms and from what we could tell it didn’t break, however, I’ve heard of microtears??? Is that even a real thing? Would you know of a microtear after inspecting the condom after use?

I began spotting that Monday (two days before AF was due). And it’s been VERY light and on and off. One minute I’m spotting or having brown discharge and the next I’m having a clearish whitish discharge. I’m also cramping a little now.

But, and maybe I’m just super paranoid after reading a post on here of someone getting pregnant with a perfectly fine IUD, does this sound like implantation bleeding or a faint period? I don’t really know what implantation bleeding is, I’ve looked it up but I need someone to dumb it down for me. Could it happen after a day of having sex?

Help an uneducated girl out (because U.S. sex education sucks🙄). Thank you!