Anyone have this happen...

After 1 year of breastfeeding my period came back. I am still breastfeeding and for the first 2 months back, my period was back to normal (came when my app said it would, I ovulated when my app said I would, and period lasted 4 days the first time and 5 the next time which is normal for me).

My husband and I made the baby dance every time I ovulated (we want to get pregnant for the last time asap) and my period did not come back for the 3rd month.

I am now 11 days late and have taken pregnancy tests every day for about 7 days. A VERY VERY VERY faint second line does appear but it is not getting any darker.

I am concerned because in my past pregnancies, I would get a dark second line after only being late a few days.

Any idea why the second line not getting darker?

Is the fact that I am still breastfeeding causing the second line to not get darker?

I will be making an appointment with my ObGyn but he's is always booked so I'm sure I will be waiting for a while before I see him.

Thank you in advance for any input.