False positive or reason for hope?

I couldn't wait any longer so I tested first thing yesterday morning and it was...positive! It was so exciting seeing the second line appear.

This morning however I tested again and it looked like a negative! If I held the test to the light or turned it a certain way I could make out an extremely faint second line. The fact that it has not gotten darker has made me feel really worried that this might end up being another chemical. I can't bear the thought of losing this baby too. The emotions really got to me and I was quite upset this morning as I don't think it looks good now. 

In the end I tried to remind myself that the last test could have been affected by leftover hormones in my system from the HCG shot last Monday. It's still too early to know for sure either way. I guess I will probably test again in two days and then if it's negative then I'll know it hasn't worked. If it's positive but very faint then it could end up being another chemical. The only good sign would be if it were a strong positive. The thought of this round failing makes me so worried. I don't know whether I would be emotionally strong enough to go through IVF again. I mean I guess I would be if I thought it had a decent chance of working but otherwise I just don't know. 

I have to try to put it out of my mind and just wait the next few days. I hate this emotional rollercoaster. Sorry this post is so negative, just having a bad day.