Ovulation while breastfeeding or pregnant again?

Morgan

Just had a baby 3 months ago and About a week and a half ago I started to feel off.. Light cramping, Discharge, Sick to my stomach, Headaches. I have not had a cycle I'm assuming due to breastfeeding.. Still having same symptoms off and on. No cycle has started and I took a test early last week and it was negative. Planning on testing at the end of the month but has anyone had this happen and what was your outcome.