Welcome to HCM.
Your LMP was 17th Sept and you did unprotected sex on 18th Sept.
So chance of pregnancy
is near about nil. Also you got 6 negative tests. Basically pregnancy test is done 1 wk after missed period. Early tests are insignificant.
Do blood test
for hcg after 1 wk of due date and check result.Consult with your doctor.
Pregnancy is only possible if unprotected coitus is done around ovulation time in regular cycle.
Your features are related to Pre Menstrual Syndrome (PMS).
Several measures to be taken.As follows:
1) avoid stress by deep breathing or yoga
2) avoid taking salt,caffeine or fatty food specially in 2nd half
3) take Pyridoxine
100mg daily with SSRI (Fluoxetine
20mg single dose)
4) may take prime rose capsule 1000mg to overcome breast discomfort.
5) may take OCP or progesteron pill (Duphaston
10mg) to overcome other symptoms
6)do light exercise regularly and proper sleep.
Be well and Tc.