To flow or not to flow??

Kizzy
Ladies .. A little advice needed!
I'm 32, and had the mirena taken out last year in December .. I've been ttc since then and nothing!
I have 35 day cycles but only bleed for 3 days when I'm on my period .. 
Do you think it's normal or that it could be an indicator that my lining is too thin to even hold an egg should everyone meet in the right place at the right time!
Sorry for the random questions .. I'm just worried