HI H.,
So sorry for your loss. I had an early miscarriage, and got pregnant just after my first normal cycle, after the OK to try again from my OB. The fertility doc I had started seeing said he would have told me to wait another cycle before trying again. I had a lot of spotting during my second pregnancy, which was really scary (that's how I knew the first one was not going well), but I ended up with a healthy, full-term baby. The fertility doc said that had I waited longer, my uterine lining would have healed better, and I would have had less risk of losing the subsequent pregnancy.
I would encourage you to go with your Dr.'s advice and wait. You'll have a fertility boost for something like 3-6 cycles after a loss, so be patient!
Best of luck to you
C.