Nexplon

I have nexplon got it put in 6-2-16 and I had a period for 2 months stop started Dec 24 and didn't stop tell April 16 then had a period for 5 day then stoped that was may then had a nother period June 2 and didn't stop tel the 4th of June and I haven't had one for a hole month and I was supposed to start July 2 and I didn't I took 5 pregnant text 2 came back not pregnant and 3 of them came back pregnant I want to ob.gyn they did some text and they said I wasn't pregnant but I've been getting sick a lot and I can't find out what's going on