I.m 37 not any birth control but have not gotten pregnant in years. My period is usually very heavy and I usually have a lot of cramps and clots. This month my period is 3 days early and extremely light. Could I be pregnant?

You could be... just about anything, or nothing.
You could be pregnant, having a light month, be anemic or stressed, winding down before you hit menopause... anything.
My periods got lighter and lighter as I aged.

You are not too old to be pregnant, so yes, why should you not be ? You pick up a gun with only one bullet, if you pull the trigger enough it will shoot at some point

Qwerty - spotting is common enough during pregnancy in some women, especially the first month, but sometimes even after.