Sharp pain in stomach… after taking Naproxen

I was prescribed Naproxen by my doctor back in November for my period pain. I always take it with food. I’m currently ovulating since Wednesday. Since Thursday this week, i’ve been experiencing sharp pain in my stomach all day long. Nothing i’ve experienced when ovulating in the past. I suspect I might have a stomach ulcer. No nausea or dark stool however. I stopped my period on January 5th. As well and last took Naproxen on January 3rd.