Thanks for the query.
According to your age and previous history better to get investigated.
Consult gynecologist once, get examined and go for ultrasound
By this any possible endometrial pathology can be made out.
If endometrium is normal, the bleeding you are having could be due to hormonal
imbalance at the time of cessation of periods.
Then taking treatment for yeast infection is sufficient.
If there is any endometrial abnormality you may need treatment depending on the severity of the problem.