Trying again ?

This is my first time pregnancy and miscarriage. I just loss my baby around 6 weeks it started of with spotting on Saturday night on Sept.2 nd and went to ER on Sunday night. I’m still bleeding. Quick question… I didn’t receive RH shot while I was pregnant because I was o + with my boood types I didn’t know that if your negative or don’t have it. I didn’t know you need to take those shot. But in the future if I plan to get pregnant again can I ask for it or no? The doctor told us that it’ll take 2 weeks. They said that its possible to get pregnant right away if we try again. They told me to wait for my next cycle. But if we want to try again how long should we wait ? Can we try again before my cycle or what ?