I need some advice.

I have one child who’s 5. When I was pregnant with him, the test was dark right away.

I am currently 4 days late. Implantation bleeding 6 days ago. I have taken 4 tests 4 days in a row and all are very faint positive. With the line not getting any darker should I worry that it’s a chemical? Going to make a drs appt Tuesday so hopefully by then the line will be dark.

Me and my SO have been trying and so excited about seeing 2 lines, now just worried because they aren’t getting any darker. 😔😩

All were taken in the time frame. And definitely lines.

Help!