Missing Period?!

Kristen • Hubby & I have been together 10 years, married 11/8/14. Angel Baby - 10/22/15. Rainbow Baby Girl, Maggie, born 10-18-16!
AF was supposed to come 3/29, glow moved it to 4/1, and then to 4/4 when it still didn't come. I've taken 3 pregnancy tests and they've all been BFNs. I'm having a lot of yellowish discharge today, had some yesterday too. I'm so confused. I really thought this was our month too because I had some bad cramping at 7DPO & we were on a relaxing beautiful beach vacation when I ovulated. I don't know what to do or think. The last time I took a test was 4/1.