Good work on a week’s denial! As for the orgasm at the end – I don’t think you have anything to be worried about.
Yes, sometimes, with a long, LONG denial it can be true that your first one or two orgasms are a bit weak, because your body is so used to just edging it feels like it’s surprised to be allowed to cum! (They soon feel amazing if that IS the case). BUT that’s only sometimes, and tends to only be after weeks and weeks of denial, and often they ARE amazing.
Secondly the more you experience denial the more you realise it’s not about focusing on the ‘big orgasm’ you might have when it finishes. It’s about how being denied makes you feel.
With orgasm denial the journey IS the destination.