Could I be pregnant?

So last month I ovulated slightly before glow said I would. I know this from opks and CM. I always seem to ovulate early. Anywho, I got what I thought was my period, still could have been, but this month I haven't ovulated and tonight I have this really uncomfortable tightness in my lower abdominal area. Is it possible I could be pregnant? Just don't want to waist money on a test of its not even likely. Anyone been threw this before? My fiancé and I have been TTC for 3 1/2 years now. This would be the best wedding gift ever! We are getting married mid June!