Periods stopping again after two early cycles is a common pattern while you're still breastfeeding.
Prolactin from nursing can suppress ovulation on and off for many months. An irregular restart like yours is not a sign of pregnancy or a problem.
Next Steps
Keep track of any bleeding or spotting. Mention the mild pelvic pain and watery discharge to your gynaecologist at your next visit, so these can be checked separately from your breastfeeding-related cycle changes.
Health Tips
See your doctor sooner if the pelvic pain increases, the discharge changes colour or smell, or you get a fever.