Ectopic

Yesterday we found out that the baby implanted in my left tube. We were able to see the heartbeat & were measuring at 6w2d. They rushed me off to get two injections of Methotrexate. The dr said we could try after my 1st period, but from what I've read, it seems as though we should wait 3 months before we begin to try again due to folic acid depletion. I'm a bit confused.