I could fall asleep right here, right now...pretty much under my desk.

I don't get it..I've had pretty decent sleep the last couple of nights, even though I was a bit sleep deprived from Monday. The only times that I've been so exhausted was when I was pregnant or thought that I was. I mean, is it possible??? I'm not sure if I O'd? Usually I have major O pain and I haven't felt it yet. On March 11 my hcg was 12, I started noticing some CM around the 18th/19th. We BD'd on the 19th & 21st. I started using the OPK, but only got a somewhat darkish line on 21st, but nowhere near as dark as the test line, and then each day the line has been lighter. Also the CM has stopped as of Tuesday, which would indicate that AF is on the way. Extreme tiredness is not one of PMS symptoms, is it??

I've never noticed before AF. Anyone have a similar experience??? I guess I'm wondering if the 'tiredness' symptom could kick in even before implantation? I know the chances of that are pretty much next to nothing, but it just seems weird