Early ovulation or false peak?

Cassie

So normally I get my LH surge between CD 16-18, and I have quite regular cycles, but this cycle I had a very, very short period and I got my LH surge on CD 11. So I went with ovulation on CD 12. Do you think that would be right or a false peak? I’m now 4 DPO (if it’s right) and I’m having cramps on and off today. Sometimes centred and sometimes to one side. Really unsure but don’t want to stress about it.