Hallow Dear,
I do appreciate your concern on delayed menses since you are used to regular
menstruation.
From your history, I do not found any cause related to delayed menses. The only noticeable event is history of
vaginal infection treated by some antibiotics course just before menses. Both these things do not result in delay in the menses. However, since no other cause can be pinpointed, you may attribute delay to the infection and/or antibiotics with fingers crossed.
You had some
brown spotting at the time of expected menses. It means that your
uterus was trying to bleed, but some how it was very meagre in amount and hence got accumulated in the
uterine cavity, which later came out as stale blood.
I feel, you may try Tab.
Deviry for five days after which within 4-7 days you should get withdrawal bleeding. If it does not, it is a good idea to report to a Gynaecologist.
If you get withdrawal bleeding, you may observe your menses for next few cycles. If the cycles remain irregular like this, you will have to report to a Gynaecologist.
By the way, you have not mentioned your age. If you are 40+ or in a perimenopausal age, this irregularity can be attributed to perimenopausal changes.
I hope this provides you some guidelines.
Dr. Nishikant Shrotri