hi,thanks for query.Just missing one pill does not put you to risk.This is only if you have taken other pills regularly and you are on pills for more then 2 months.Again you had periods after missing tablets so chances of pregnancy
are not there.The symptoms that you are having may due to too much of anxiety
or stomach infection
.You can not test positive unless you missed periods.Please take treatment for the problem that you have and do not worry about pregnancy.
wishing you good health.