Hi thanks for your question.
You are experience symptoms suggestive of pregnancy
and your pregnancy test done seven days after missed period is negative.Pregnancy test usually comes positive 7 to 10 days after the missed periods .So your test may come positive after 10 days.I would suggest you to repeat the pregnancy test 10 days after missed periods.You can also confirm your pregnancy by ultrasound
after 10 days.
Hope this answers your question.