Worried

I've be absolutely desperate to conceive and have been trying for almost a year. I'm due on my period today (30th July) and tested on tues to find a v faint line! I'm am/was so so happy, I then tested with a clear blue and got a faint cross and then clear blue digital and got a 1-2 pregnant - all of these were in the afternoon.

I tested again on Wednesday morning 1st thing again to get the same faint cross and same digital result. I then test this morning with a tesco test and the line was v faint and didn't another clear blue and got a even fainter cross than before.

I obvs did the wrong thing as I googled and read that hcg levels my be dropping v hence the faintness so I may end up miscarrying.

I already have a daughter and when I tested around the same time as I am now the line was really dark.

im also feeling like I'm going to xe on and feel sick

Anyone advice?