Could I be pregnant? Help!

Giovanna
I am 3 months PP and I've had my first period since giving birth at the end of February. I was expecting to get another period at the end of March but I didn't. I am now 2 weeks late. I am still  breastfeeding so I'm not sure if that has anything to do with why i could be having irregular periods. I took a pregnancy test and it wa negative. 
Has anyone had this problem ?

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