Input? What do you think?

Usual cycle length 29-33 days or so. Had sex day 11 and 13 (he didn't come on day 13) with the diaphragm (one of the lesser effective methods). I haven't had any PMS symptoms that I noticed, and am supposed to start tomorrow (I bet it would more likely be Monday). I have been really fatigued, and in the afternoons I've been getting nauseous and having queasiness sometimes throughout the day. Been bloated some too. This afternoon is the worst nausea I've had. We aren't TTC but it could be possible. What do you guys think? My beasts aren't sore or anything. I'm just stumped by this lack of PMS. I feel like I'm pregnant. Is that a weird feeling to have?