fading BFP...... has anyone had this happen?

Kayleigh
I tested yesterday with a cheapy and got a very faint line. Bought a clear blue easy and retested this morning and got a clear BFP within the time frame but 5hours later its faded. Now I don't know what to think?? Top pick was at half 5 this morning, bottom was was a few mins ago. This is the same test just photos taken a few hours apart. Any advice is greatly appreciated xx