What is going on

Ashley • Mommy of 5 beautiful children. Kaylee-7, Caleb-5, Corissa-4, Kenzie-Ann-17 months and Gabriella 15 weeks
Well I really don't know what is going on with my bady right now. Yesterday I think I had implation bleeding and now today I tested and ladies are telling me a faint line but I see nothing just looking at it. Today I have been have some cramping and heartburn no bleeding and I feel bloated nipples are senctive, my back is killing me ( let alone I have 3 small children) I just started ttc after a lose in December and trying to be more intuned with my body but not sure how it all works yet sorry so long just wondering if this is normal or not any advice would be wonderful thank you