Seeds in bud

I have chopped it to be fair it was only the lower buds with seeds from what I can see. It has been growing outside could this be the cause as in bees !!

It got pollen from somewhere, which is why it contains many seeds.

Its an autoflower so yes harvest it asap if you want to smoke flower, if you are going to make extractions then keep it as long as you wish since the seeds growing won't be as annoying. If it was a regular cannabis plant you could have some uses for it but since its an autoflower and should be a stable feminized then it just failed it purpous and its not wise to continue its genetic spread. So do as you please but i wouldn't use those seeds for nothing else besides of making them into powder and use as a flour substitute for some pancakes or for some fried chicken covering.

If the seed are mature enough I’ll harvest so I can replant a new seed for next year since she is already filled with seeds. If not I’ll let it go longer. If you have other females in room then you might wanna separate them