I'm super paranoid about getting pregnant again even though I'm on Nexplanon...I COULD NOT handle…

I'm super paranoid about getting pregnant again even though I'm on Nexplanon...I COULD NOT handle another baby right now. I was thinking we could try for another when our son is around 5 years old. We don't even have our own place yet, and my boyfriend is out of work right now, and I haven't worked in over six months because I'm trying to get my AA. I'm just really scared. I keep thinking I feel symptoms or flutters because I think about it so much. 😔