Ttc with tubal ligation

Nikki
I know it's not impossible and we are going to start seeing a specialist but I'm 8days late and I've been on time like click work for 4yrs. I'm not showing positive on pregnancy tests but I didn't with my other 3 boys until I was a few weeks late. I'm not sure if I should be worried about a tubal pregnancy. Has anyone else gone through anything similar? Any advice please.