Period is 5 days late

Hika
I've taken 3 pregnancy test and they were all negative. 
My period has been so out of whack. 
Anywhere from 12 days late, then I'll have a full 7 day (usually I have a 5 day period) then 4 days later I'll have another 5 day period. I'm very irregular. 
Went and asked my doctor about it and she sent me for blood work. Still waiting to hear back. 
My last period was 8-9 days and it was very heavy with lots of clots. 
Lots of pain during sex, it feels like he goes way to deep and hits my cervix. 
I do not take birth control. 
Anyone else deal with this?  Or have any input? 

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