BFPs and Spotting??!

Sheyna • DH and I are both 22 ttc after MC in December 2013, May 2014 and April 2015. Praying for a sticky Rainbow baby soon!!!
​​I am 19 DPO so I am missing my period. It's 4 days late and I had 3 BFPs yesterday but I woke up this morning cramping and spotting? It's not like a normal AF but it's constant. Is this normal? Could I be miscarrying again?