Is Pregnancy Possible Through Intercourse During Ovulation?

Question is should I invest in a home pregnancy test or do you think it would be a waste of time and money? I use an app calendar to track my periods and ovulation, as well as my "intimate dates." I am diligent to mark each significant date. And it's very accurate in predicting my estimated periods. According to it, I should have started again this past Saturday (3 days ago) I'm not your average 28 day girl...usually 32 days. I last had my period on Dec. 2nd 2014, since then I had a weird light pinkish discharge around Christmas, but here's the kicker....My last "intimate days" were November 11th, 17th, 19th, & 30th. That Period was Nov. 2nd, and ovulation was the 18th. I also show symptoms, but they could be related to the flu or food poisoning. Your thoughts???