not sure what's happening??

Lisa
My last af was 8th march 17 I've still not had  af still! This is Day 47 of cycle taken 12 pregnancy tests all negative also taken one at doctors and that was negative!
Doctor sent bloods off on Friday so I'm hoping to find out what's going on this week!
Anyone else been in this situation? I'm just really confused last time I missed af I was pregnant with my son..