tests are negative is a consoling information. Though pregnancy during lactational amenorrhoea is a known phenomenon, negative results of pregnancy tests have ruled out this possibility.
The pattern your bleeding indicates that you are facing some hormonal
If you are breastfeeding
the child randomly, such irregular spotting to bleeding may result. If you are not feeding the baby on the breasts, I would advise you to take some Progestational preparation like Deviry
for 5 days and you will get withdrawal bleeding within 4-7 days.
After you get withdrawal bleeding, you have following options:
1. Just do not do anything and wait for your next menses to appear.
2. However, even after this if the spotting continues, or you want to have your menses regularly with contraceptive
effect, start some oral birth control pills cyclically from the day 2 of the bleeding. They will regularize your menses and also will protect your marital relations from the pregnancy.
Please report to your Gynaecologist.
Dr. Nishikant Shrotri