Advice please! 🌷

Hi Ladies! I’m trying to be proactive and am looking for any advice I can get. I’m 34 years old and will start trying to convince in the spring. I’ve been on birth control for about 10 months, yet do not consistently get a period. I’ve never been pregnant before. When should I go off birth control? When should I start taking prenatal vitamins? Any other tips would be appreciated!