How likely is it to get pregnant on nexplanon? i've been experiencing some pain under my belly button but nothing else beside that. i do have endometriosis too.

Very rare, but: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A home urine pregnancy test gives a reliable result by about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. An Ob-Gyn doctor can evaluate any persistent or worrisome symptoms.