Advice..

Cheryl • 34 TTC baby #1, married 3 years together 15. Still completely head over heels in love!!❤
I see a lot of ladies using pink hpts. Are the pink ones better than the blue? Whats the difference if they are? I have been using clearblue +/- ones. I have noticed that the last couple i bought already had a faint blue line on it. Does that mean there bad?