Pregnant while on Nexplanon?

So I have been feeling not myself lately. Nausea and some vomit action (tmi but straight up yellow green bile), metallic taste in my mouth as if I were suckin on batteries. The thing is, I’ve been on nexplanon since March... could I be pregnant? I think it may be too early to test because it’s only been like 2 weeks since I did the deed, but I don’t know. Any insight would be much appreciated. Or even thoughts on the matter. Thanks in advance!