Taking birth control

Michaela
Ok I took a shot called methotrexate for a ectopic pregnancy on the 16th of November and I believe I just started my period yesterday. I know that I need to wait for three months before we start trying again. But my doctor wants me to take birth control for two months then after taking it wait one month for it to get out of my system do you think it would cause it longer to convince? Or should I just take the birth control? Or not