Please help!

Ok so in the 22nd I took a test because we have been trying and both had dreams of a positive test. I took the test and a very faint 2nd line appeared as you see below. I left my fiancé the test on the table for him to see and he says the line was there but by time I have made it home from work the line had disappeared. I took two more since then and both have said negative. We are so confused and unsure if this happening or not. My breasts are sore on and off all day,  I feel naseous in the mornings and my lower back really hurts! Has anyone had this happen to them?!?