my lightest period that i've had.

Hi,
Welcome to ehealthforum,
You can experience period pattern changes due to ovarian cysts, hormonal changes/imbalances, endometrial changes, etc. The midcycle bleeding that you describe could be suggestive of hormonal derangements, infections, endometritis, ovulation bleeding, breakthrough bleeding, use of any medications, ectopic/regular pregnancy, etc. It is difficult to comment on the cause for your symptoms without examining you and going ahead with further evaluation. The exact cause can only be made out after careful evaluation. Consider visiting your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the abnormal vaginal bleeding that you describe. Treatment as appropriate (based on examination findings and investigations results) would be started to help you regulate your periods. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.