Thanks for writing in.
Having whitish clear discharge per vagina at the end of period is unlikely until and unless you are pregnant.
But you are writing here that your pregnancy
tests are negative. You are having pain on belly as well as naucea which can be attributed to hormonal
But still as you are having watery discharge, I would recommend you to wait for 1 more week to get periods. If you still do not get your periods, then do blood HCG
test for pregnancy and abdomino-pelvic ultrasound
to rule out ectopic pregnancy.
I hope I have answered your query. Revert back in case further clarification required.