Could I be pregnant??

Well, the last day of my period was the 22nd of June. My fiance and I had unprotected on the 24, 25, July 4, 5, 6, and others that I cannot remember. Anyways, around July 7-12 I was feeling really nauseous all the time but I was hungry. I had a lot of cramping and twinges. I do not have that now, but I am feeling unusually tired. I usually can stay up until whatever time; however, now I need a nap and am exhausted by 9 O'clock. Also, I have extremely moody, I mean everything just ticks me off. I am a very layed back person so this is strange to me. I took a pregnancy test about a week ago and I am pretty sure it was negative. Considering my periods are usually very inconsistant, I am unsure when I should have my period. Before my periods, I usually get really nauseous which was how I was feeling 2 weeks ago, but nothing. Any advice would we really appreciated. Thanks!