Birth control after WLS

I had to stop my birth control before surgery and was able to restart it this past Sunday. This entire week I've been super nauseous and I finally put two and two together that that was the only thing that changed. I haven't taken it for a couple days and now I'm feeling fine. I'm not on it to prevent pregnancy but rather for menstrual problems. Has anyone had this issue and what did you do? IUDs are a no go because I have a heart shaped uterus. I'm considering retrying it again in a month or two.