Idk if I’m pregnant or not?

So me and my bf did the uh oh on my ovulation day which was on Dec. 16th. I have been cramping,bloated,gassy,and tired for 2 weeks. I can’t lay on my stomach when I sleep bc it hurts. I took a pregnancy test on Dec 27th and it said negative but my period doesn’t start on the 30th. Was it too early to take one? Should I wait to take another one?