I had COVID in November. Per our state and the CDC you can choose to wait, but you can also go ahead & get it within that 90 days. The medical director of out county health department says go ahead and get it, especially if you had a mild case of COVID because there's thought that you may not have built up a very strong immune reaction if you had a mild case.
Our high school nurse had a fairly rough time with COVID and our doctor told her to absolutely get it even though she was within 90 days.
A teacher of mine said her cousin, who is an epidemiologist in Tx, told her NOT to get it within that 90 days because it might compete with your body's natural antibody building process. But I can't find any evidence to support that.