no period due to breastfeeding?

Lyndsey
My daughter was born in December 2016, and I didn't get my period until April 20, 2017. I was mostly formula feeding her at the time, and now I'm mostly breastfeeding and my period is 8 days late... I'm just wondering if I could be pregnant again or did the increased breastfeeding mess up my cycle? Thanks for any help or advice!