Irregular periods?

Andrea

So… don’t know how to start but my baby is 8 months old and is exclusively breastfed and I got my period when he was 7 months for the first time since he was born. Then it hasn’t come back??? I’m almost 3 weeks late and I feel cramping all the time and I already took 2 pregnancy tests and they both came back negative so if I was im sure It would be positive already! My question is… Is it normal to have irregular periods while breastfeeding or no?