Autism

I have autism and I'm very very parnoid and worried. I finshed my period and next day I got my implant in. I read all about it. I read it can stop your period and takes seven days to work. My first bc i ever tried I got a clot within seven days hence getting implant in 3 years latter. I got it in may 15. My doc said wait 14 days with no reason why. I had sex on the 13th-14th (depending on if you count day as insertion or day after) day it was in. The day i had sex was an excact 7 days before my first period on the nexaplnon. Seven days aftwr sex my period was a no show. I took a test and it was neg. Now i also now about cervixs. mine is very very low but feels closed. I'm very very worried I'm preg since I had sex on the 13th day it was in and that my test was wrong bc i had sex week before my period. I'm having a very fullblown pankc attack bc the nexaplnon manufactures papers and site said 7 days and every site ive been on.