Could I be pregnant or something else?

I was had my baby in March. I started taking birth control in May. I missed a pill in mid June. Therefore, I had two periods in June. I didn't want to take anymore until my next period in case I conceived. My husband's brother has had birth defects from a type of birth control. The second one started June twelfth. I haven't had a period yet. I have been craving bananas like crazy. I never craved those before. At least, not this much..... I have been eating them like crazy. I feel nauseous and have had dizzy spells that caused me to fall several times. I have fatigue . I might be putting too much thought in this. I have taken two pregnancy tests, both said negative. It was the dollar tree ones. Some people say it would be too early to tell. My husband and I have sex at least seven times a week, unless I'm bleeding. He doesn't wear condoms. So..... I was wondering if I'm low on potassium, if I am pregnant, or messed up my schedule. I will seek professional opinion if I don't start next week. Just was curious what everyone thinks......

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