help first a positive, then a faint, followed by negative....

Katie
My husband and I have lost one child through miscarriage last winter. We are ttc again. I took a test late in the night last night and through it was positive. I took another because one was not enough for me. It was faint but I think there. Then I got two negatives... I think. I'm so confused. I took another this morning and my husband says he can see a line. 
Original two tests 
All the tests I have taken in the order I took them from top to bottom.... 
help!