Late period

Hi. I’m 4 months post partum. I’m also 5 days late on my period. I exclusively breastfeed. I got my first pp period at 9 weeks, then again 2 weeks later, then again 3 weeks later. Now I’m 5 days late from a full cycle length and STRESSING. Negative test… I think? It’s also 7pm so hcg would be lower. There’s a faint line but not sure if I see it cause it’s supposed to be there or if it’s a possible positive. Any insight on this? Anyone ever had super early periods then a late one? Thank you!