Congratulations on your first brug blossom. It can still take more than a week once the skirt (not sure of the proper name) starts to show before your brug is fully open.

You probably have a moth caterpillar, maybe a hormworm. I thought it was late in the season here for tomato hornworms but I've found loads of baby ones on my brugs and daturas. Hand picking is the best way to rid your plants of them if you don't want to use insecticides or Bt. Spraying with a hose doesn't seem to dislodge the little beasts. There's not much time before the first frost so the caterpillars, if that is what they are, shouldn't be a problem for long. You can give the plants are really good cleaning before putting them up for the winter. I don't use any chemicals while they are growing outside but I do treat them before storing them or taking cuttings that will be going inside.
Karyn

Thanks Karyn for your help. I just go and check them every few hours. I think more of the flower is showing now than this morning. I have been doing the happy dance for awhile now. I can hardly wait to see them and smell them. By the way what do you treat them with, before putting them to bed for the winter? I have no idea what to use. Thanks again.
Donna

Donna the ones I'm going to keep growing will be treated with a systemic insecticide and hosed off well with water. I'll probably submerge the pots in water for a while to kill anything hanging out in the soil. I'll submerge the potted brugs that I'm letting go dormant also and hosing them down but won't use an insecticide on them. The cuttings will just get hosed off. I read about watering the plants using water that has had a Mosquito Dunk dissolved in it. I might give that a try. The dunks are made out of Bt and are used for aquatic gardens or standing water. I absolutely hate using chemicals and never do during the growing season when the plants are outside but I can't be bringing bugs into my house or greenhouse. It's bad enough knowing that I'll be fighting spider mites during the winter. I get them no matter how high I try and keep up the humidity. I never have to deal with them outside, even during a dry spell.
Karyn