possibility of being pregnant

OK so June 7 I had sex for the first but doing sex he could hardly keep it in me. I was just so tight and he was too big I think it was just hard. But anyways beside the point, he said he didn't even get far because everytime he went to thrust he'd fall back out. But I've been having really weird stomach pains lately. Could it be possible that I'm even pregnant he said he didn't cum in me. But I don't have any other explanation for the pains. Any help would be greatly appreciated. And yes I am thinking about getting a test