Advice needed

I am anywhere from 7-9dpo. I am having horrible gas and pressure in my stomach. Like it feels like its stretching and like I did an ab workout. Also, my boobs are tender to touch.

Last night I was laying in bed and it felt like an odd pop sensation in my lower abdomen? Idk how to explain it.

Took a cheap test this morning but negative, no surprise there.

Right now I'm just sitting here and it feels like a weight on my abdomen and my back is killing me. Not painful like af cramps, just uncomfortable.

Is it possible that the pop sensation I had last night was implantation?

Update because this has been said a lot. I dont have endometriosis or prone to getting cysts. I had one a few years ago, I definitely remember that pain so I know it's not a cyst.