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The delay in getting periods could be the side effect of the medicine you are taking to lose weight.
Vaginal bleeding after masturbation can be due to cervical polyps, yeast infections, endometriosis, cervical dysplasia which is a precancerous condition, uterine polyps, uterine fibroids and cervicitis (inflammation of cervix). If there is a history of unprotected sex then STDs such as Chlamydia, gonorrhea, and trichomoniasis should also be ruled out.
Please consult your doctor or gynecologist and get yourself examined as a confirmed diagnosis cannot be given on net. Hope this helps. Take care!
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