Ewcm please suggestions

Hi I am getting very frustrated we have been trying for 4 months and nothing, we are hoping this month but not sure yet. It is really becoming a chore for my husband and I. 
I have egg white cm Saturday and Sunday so we BD as well as the Friday and Thursday before, so that would be day 13-16. However day 17-19 I still had slight ewcm, could I have missed my window? Even though o had ewcm Saturday and Sunday. Just so confused! Please suggestions would be great