Nexplanon REMOVAL. Am i pregnant already?

Last missed period- 10-10-15. Had baby 6-23-16.Irregular bleeding after birth- then had Nexplanon inserted in 09-2016. No peroid whatsoever, not even a speck of blood from that day forward.Fast forward to Sep 9th 2017- Removed Nexplanon.Had unprotected intercourse several times since removal and yesterday 10-24-17 i started experiencing PMS and spotting.Could i be pregnant? Or just getting my period back? I also want to add, I have exclusively breast fed my son, and i still do at least 2 times a day, he is 16 mo. Pls help- any input or advice would be so appreciated. Thank you.