Does anybody know what this is?

Nausea, tender breasts, fatigue, cramping, headaches, hot flashes? I'm 19 years old and married and I've been feeling this way for about a week... especially the nausea and headaches. I just had my period 7/23-30 and not supposed to have another till 8/23. I'm on low hormone birth control pills but I missed about 3-5 during the end of my period and didn't start again till 8/1. My husband thinks I might be pregnant and I'm just not sure but I'm not taking a test till at least the 8/23 because I don't want to waist our money and we aren't freaking out about maybe being pregnant but I would Definitely like to know why I feel this way. so if anyone has any idea of why I feel like this please let me know!!! (and please don't say go take a test because I'm waiting and you'd be wasting your time.)