am i pregnant? or just pranoid? (nexplanon)

so we had sex about 2-3 weeks ago and he ended up cumming inside me when we usually pull out. most of it came out plus i’m on nexplanon, but i cant help but feel anxious.

i’ve been on nexplanon for almost 5 years, currently on my second implant, and i’ve only started being sexually active recently.

i’ve been getting back pain and some cramping. i’ve also been a little bloated. today i felt a little sick but it subsided very quickly. there’s no change in my breasts/nipples, and they haven’t been sore or tender.

im only 18 and i think im just psyching myself out, but i figured it wouldn’t hurt to talk about this here. thank you