8 days late

Hi, I have been having many pregnancy symptoms (nausea, vomiting especially when I eat, sore breast, mainly nipples, cramping, fatigue, headaches and back pain).

I am now 8 days late on my period and my period is very very consistent, cycle of 31 days always. I should have started on the 30th of July and it is now August 8th. I have been testing and consistently getting negatives (dollar general and first response tests) but this morning I took a first response and it came up with a faint line. But then took a cheap test to see if it would come up positive also, and it was negative. What are the possibilities I could be pregnant. *also with my now 3 year old, I had negative tests for the first 12 weeks of my pregnancy. Then finally got a positive.* picture below is test from this morning and then the cheap test right after. Picture was taken within 3 minutes after taking test. Please help. Our baby just passed away in March at 3 months old and I want a baby again so bad 🥺 I’m just scared to get my hopes up.