Line Progression

According to the first day of my last cycle & this app I am 4 weeks today. It still doesn’t feel real and I’m so scared that that my lil bean won’t stick. Ive wanted this for so long and we’ve tried for over a year. The first test was taken on Sunday in the middle of the day, the middle 3 were taken Monday with fmu, and the last one was taken today with fmu. This is a good thing right!? I just need confirmation. I don’t think I’ll be able to breath until our first ultrasound. I’ve had light cramping and I know it’s normal but I can’t help but thinking af is coming.