Married- Period due by 5 days. Do next.

I had my last period on March 8th. I usually have a 31 days cycle. This month just 1 day before my period from 7th April to 11th April I had all sort of pregnancy symptoms. Like nausea, lower back pain, frequent urination, pelvic pain, tiredness, slight fever on and off. I never have these symptoms before periods and we weren't planning for the baby right now(no unprotected ejaculation ) so I was confused about how this is happening. And I also haven't been so late on my periods. The max late was 2 days ( happened once) without any above symptoms. Today,being 5 days late I took a pregnancy test at home with prega news in the morning and it came negative and even all my symptoms have become very dull( almost vanished). But I haven't got periods yet. I am really confused and even tensed about what's happening with my body. It would be great if you could read my symptoms and guide me about what to do next. Thanks in advance.