Tiniest blood

Hannah
I woke up this morning and there was the tiniest speck of blood in my knickers. There was nothing when I wiped and I have no cramping. I did sneeze last night which hurt, I don't know if that caused it. I don't know whether to be worried and get it checked or not!? I'm in the UK and 13 + 2 weeks pregnant Just some advice no horror stories please. Thanks