Advice??

Jess
I'm currently cd38, 6 days late.. did a random test 8dpo and it had a faint + 
Did a test a week ago today and two days ago which were both negative, been crazy hungry last couple of weeks, had weird cramps and been so tired/dizzy but still negative tests!! What should I think?? 
Getting fed up of BFN's after two and a half years 😭