Nexplanon pregnancy??

So I got my implant on July 18th of this year. I got it placed 5 days after AF. I didn't get my next period till 3 weeks later and then had a period every other week for a month, then the next week I had spotting for 2 days. Now, I have not had a period or spotting for a month. I'm married and have had unprotected sex several times. I've read that pregnancy with the Nexplanon is very rare, but my body has felt a bit off lately. Sensitive breast, bloating, frequent urination and nausea. I have also read that these could be side effects of the BC as well, I just want to be reassured that it's just in my head and my body is getting use to being in birth control. The only thing that I've change in the last month is my diet; cut gluten and dairy out and I was in a antibiotic for 5 days. Otherwise nothing else changed.