no line now faint line

Sophie
So I took a pregnancy test this morning, it is a week before my period is due but I did have sex before while and after ovulating. This morning there was no line whatsoever now hours later (evening) there is a very very faint line. Does this mean I'm not pregnant? Or am I testing too early? I am having symptoms (back pain, feeling sickly and sore breast) but not sure if I'm reading too much into everything. 
Thanks in advance 😘