... are confused .... or confusing us.
If u arrived on a fiancee visa (which I believe you are saying)....
then you use this to get married.
You do NOT "swap" it for a spouse visa.
After getting married, you then need to apply for FLR ... Further Leave to Remain.
If/when granted, that entitles u to stay another 2yrs (give or take).
At present, the FLR takes about 3mnths to process
