Nexplanon or seasonal pill

Jennifer
I'm 7 weeks pp and looking at not haven anymore kids cause of my heart my obgyn put me on the nexplanon about a week ago and I been getting high mood swings on top of being on depression pills to help control it and I feel I gained weight since I started it but one thing I'm concerned of the day I got it put in I had sex and was told to use protection well my hubby dislikes condoms so he pulled out then few days later we did it again that time he let the cum go in me and idk if this is effecting off the birth control but I been haven cramps and off and on spotting and sometimes holding my daughter the weight from her hurts my stomach and before I got pregnant with her I used seasonal pill and liked it but my obgyn didn't want me going on it since I don't plan on haven more kids or least still deciding on what's best for me still but she thought being on a pill is to much to keep up with but I never had a problem on it in the past but this nexplanon birth control I ain't sure if I can have it removed and go on what I want to go on instead