2 days late...bfn....brown cm

Anna
Help ladies. 
So we are ttc and this is our first month trying. AF was due 5th March and yesterday I had very light pink when I tidied up after a wee...and today it's light brown. I've done 2 tests both negative. I'm currently full of cold, worn out and my iron is really low-all the symptoms I had with my first. 
Is there anyone else feeling the same as me? Xx