lower back pain menstruation

Can a pregnancy test work?
My boyfriend and I had unprotected sex and he came inside me. This was a week and three days ago. I'm taking the pill but missed one .. I've only been there for two months. Since I'm on vacation I did not want to have my period (which was supposed to be on Sunday and now Thursday) I skipped the green pills. I did not think my body used to the pill and still hoped that some stains, but there was none. Anyway, I was also experiencing nausea, fatigue, mood swings, headaches, pains in my stomach, lower back pain, and breast tenderness. These could be signs of menstruation .. or something else. I took a pregnancy test and presented is not pregnant, but I was wondering Would it be too early to say? I'm on my 3rd package now. PS-When do you take again?
Assuming that your body produces the average number of pregnancy "hormone detected in home pregnancy tests – the test can detect if you are pregnant the first missed day one menstruation. After it has been 7 days w / out his term – I recommend going to the doc.
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