Getting pregnant on birth control(iud)

Me and my husband have been thinking about having our third baby. Buttt I have an iud the implant in your arm. And I got it with medicaid and they won't take it out till our 3 years is over. My daughter just turned two. I know a year isn't that long but it feels like it when you want another baby. So has anyone been weird like me and tried getting pregnant with birth control. Like purposefully canceling out with antibiotics or something and then getting it taken out once you get pregnant. I've even tried st. John's wart herbal pills that supposedly makes birth control less effective