confusion over ovulation and fertile window

I had a full pwriod on June 22nd and then on the 5th July I then I had a very light bleed not another to fill a sanitary towel (I think this is classed as spotting ) do if it was in actual fact spotting instead of a light period om confused on when my fertility window would be I'm trying to conceive monitoring my cycles and ovulation abd unless I can find out when my wonderful is depending on if it spotting or a light cycle I will be inaccurate u have a 24 day cycle length and have 4 bleeding days any help would be appriviated