Had tank pumped in January, two weeks later one toilet overflows and the other toilet leaks on floor and the shower backs up. Any solutions

You either have a blockage in the line to the septic tank or a drain field that's so saturated that it can no longer disperse the liquid the tank sends it. Open up the septic tank, If it is full to overflowing you have a bad drain field. Good luck. Tom

I fully agree with Tom. When you open the tank it should be FULL but not overflow when a toilet is flushed, good tanks are always full