Welcome to HCM.
There are several reason of missed /delayed period.
test is negative and got period.You may confirm with USG lower abdomen.
It is probably due to hormonal
imbalance,stress or irregular eating habit.
Wear tight breast support to get relief of tenderness along with take PRIMOSA
1000mg capsule daily for 1 month.
Take healthy diet,avoid stress,proper rest and do meditation
in early morning.
Be well and tc.