Tightness and pressure

The last two days my stomach has felt super tight with a ton of pressure. I'm thinkin it can't be pregnancy because I ovulated on new year's <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> to January first and I just doubt I would be having any symptoms that early. My question is, which of you ladies have had that and what did it turn out to be?