How long did it take for your very faint line on pregnancy test to turn into a proper non-squinter

[Wisteria25]

Is it normal to have a couple of days of squinters? Or would you expect a squinter to turn into a proper line the next day?

With my first, it was the day after my period was due x

Same here. Very strong line each time and I tested on the day my period was due.

With my now 3yr old son I did a 3 day fresh transfer and I tested at 8dp3dt and got a negative. 9dpt I got a squinter so tested again at 11dpt and it was only a little darker so thought it wasn't going to end favourably so I stopped testing and waited for beta. At 14dpt It came back at around 92 and turned out my hcg was only just doubling every 3 days.. sometimes you just need to give it a couple extra days for the hcg hormone to increase higher enough to make changes to the hpt.

Is this a very faint positive line?