Am I going crazy ?

Well my partner and I had intercourse few times on the week I was ovulating.But like two days after on my last day of ovulation. My stomach is hard like ball . A little cramping on my pelvic area . . I’m constantly peeing every 10 minutes and very moody . Yesterday, I was so tired and I was little bit of nauseous. But it went away . But mind you I been waiting to miss my period so I can take the test . But it possible for someone to experience this ? Is even possible for someone to experience some what like very early pregnancy symptoms? Can some one help me ?