My husband and I have been having unprotected sex about everyother day for the past month. My period would be due this Wednesday, but instead it came about a week early, and very very light, spotting for two days, then one day of bleeding (but only when doing high physical activity) then two days of spotting. It was brown blood in the beginning with light pink then red on the 3rd day, then finishing with light pink. My periods are very normal and consistent and much heavier. I was wondering if this is a sign of pregnancy or decidual bleeding.
I did take a pg test on Wednesday in the middle of the day, it was negative, I plan on taking another pg test Sunday morning first pee of the day.

It's possible it is due to pregnancy... some women have what appears to be an off period in early pregnancy. Or it could just be an off period.

See what happens when you test on Sunday. If it is negative, wait and see what your period is like, if it shows, for next month. Fingers crossed!

Thank you for the advice, Ill let you know how the test comes out! :)

I took a test this morning, and it came out a BFN. Thanks for the advice though. :)