Stress and periods and pregnancy and IUD

Okay so obviously the easy answer to this q is taking a test but haven’t had time!

I haven’t been having sex for a year and a half and just started up again... new boo, you know how it is! And I have an IUD- so have been using condom half the time and pull out half the time.

My period is behind by a few days. I already had the cramps, normally signaling it’s start, but never had the blood? I’ve been SUPER stressed (I have anxiety) about this upcoming business trip with a big presentation which I am currently on. And I had sex in the two days after cramps, which my friends say sec on your period can make it lighter. My periods have been lighter on my IUD but there has seriously not been anything this time, just light brown spotting that I noticed on the sheets after sex and one or two other days.

Does anyone else ever have lesser periods because of stress and/or sex??

And yes, taking the test when I get home from my trip just to be sure.