Could I be pregnant or just over thinking

Lexi
I think I might be pregnant. 
I was late taking my BC Pill a few days in the middle of my cycle, and the last few weeks after that I've been feeling dizzy, haven't been able to eat, super moody, sleeping more than normal, and I've been having like weird little cramps but they don't really feel like cramps. (could they be gas? I haven't been very gassy) I took a clear blue test a few days ago and it was negative, a day later I took a nother and the test didn't work at all didn't read anything on the screen at all. I'm supposed to get my period tomorrow or the next day if it's late I'm testing again! But I just want to know what you guys think?? Should I test sooner or just wait and see or am I fine and shouldn't worry? 
I'm sorry this is so long!! 
Thank you guys!!

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