Ok, I registered and came out of lurk mode just to reply to this post because I'm in a really similar situation! Was that test an internet cheapie that has a sensitivity of 10 mIU? I have gotten three of those lines on the last three tests, really really faint, look exactly like yours!
I'm cramping to beat the band and my period is due Sunday so I'm really questioning how accurate they are. But I hope they mean BFPs! Keep us updated.