Seeds forming in unpollinated bud?

I just don't understand what's happening. I had a couple of plants growing and I got bad spidermites, also the plants did receive a little nute burn and heat stress, but nothing major except the mites. I had to harvest the bud early, 5 1/2 weeks of flower and I cut it all off the branches today after drying and I noticed what I think is a seed pod with a half formed seed in it. What the hell is this? My plant has no male flowers, I have not been in contact to any pollen anywhere else but still a seed appears to have been forming. This strain is actually a bagseed I got in a baggie off a friend, but can a plant actually give seeds without turning hermaphrodite and not receiving any outside pollen? I got rid of the mites using a toxic ass no pest strip and will try to finally get a grow with no stress, but I still don't get how this premature seed has formed. Stress normally induces formation of male flowers which in turn pollinate your bud but I have no male flowers on my buds. Also I was wondering where bagseed comes from? I mean if you get a baggie off a dealer with seeds what could have possibly created the seeds? I believe it could come from a huge outdoor grow where a few male plants could have been missed, or a hydro grower who somehow light stressed his plants. Any advice would be appreciated thanks.

If it is indeed a seed that has formed inside the bud, then that bud has somehow become pollinated. A mite infestation coupled with heat stress, nute burn, etc., is generally more than enough to cause a hermie. Maybe you just didn't notice the male pod before or after it opened up and cross-pollinated itself.

Another possible reason could be that you accidentally pollinated it by coming in contact with pollen somewhere, and transferring a single grain to the female when you went into your grow room. This is actually more common than you might think, and is why it's recommended that you don't enter your grow room immediately after being outside, in the woods, at another house where blooming males are present, etc. You aren't going to notice a single grain of cannabis pollen that happens to land on your shirt, and of course, you wouldn't notice if that pollen were to fly off of your shirt, and on to one of your flowering females.

Yea could be pollen off me, since while they were flowering it would have been close to harvest time here, so probably a lot of pollen in the air due to some male plants finishing their flowering. I just hope the bagseed I got doesn't have hermaphrodite genes, but I assume I would have seen a male pod somewhere, which I haven't and I did trim all my bud carefully by hand. Then again I am new to this, so I may have missed a pod. I just wanted to be sure that a seed cannot form unless it is pollinated, which I know is not possible unless the seed were to be haploid and therefore not fertile. I should probably get a strain other than this anyway, although I am surprised with the quality bud this bagseed has been giving me.

maybe ya not a nad hidin in or under a bud cluster? possible?