You are TTC for 6 month and presenting with secondary amenorrhoea & negative pregnancy test.
Do a blood test
for B-hcg to confirm/exclude pregnancy. If again negative,do followings.
There are several reasons of delayed period like hormonal imbalance,stress/anxiety,ovarian cyst
, PCOD,thyroid problem,wt gain/extreme loss,irregular eating habits etc.
Need to investigate properly to rule out underlying pathology by USG lower abdomen,Thyroid profile,LH/FSH,blood estrogen/progesterone
level etc.So consult with your doctor and take suggestive measures.
Do unprotected sex around ovulation time and use ovulation prediction
kit to predict ovulation and prepare for that. Ovulation occurs approx 14 day before due date. May need ovulation induction
drug like Clomiphene along with Progesterone pill.
Avoid stress,take healthy diet with Vit-E & Folic acid supplements,control body wt and proper sleep.