The dollar fell to its lowest since mid-November after the Fed disappointed investors, before trying for gains.
The British pound skewed on Thursday after the BOE announced it was keeping its interest rates unchanged and raised its growth forecasts.
The U.S. dollar index has now erased most of the day's gains in the wake of the decision.
The U.S. dollar tumbled against key rivals on Tuesday and was on course for its worst month since March.
The dollar fell against the Japanese yen following a weekend of headlines relating to President Trump's executive orders on immigration.
The dollar rose against the yen, once again buoyed by expectations that President Trump would deliver on his campaign promise.
A further fall in the price of the Mexican peso Thursday has left market participants cautious on where the currency could be heading next.
The dollar hit a session high against the Mexican peso after Mexico's president said he would not attend a meeting with Donald Trump.
The dollar tumbled to a 7-week low on worries that President Donald Trump was focusing too much on protectionism and isolationism.
U.S. President Donald Trump needs to be clearer about his fiscal policies so one can better understand what may happen to the U.S. dollar, a currencies strategist told CNBC on Wednesday.
The dollar firmed against the yen and euro, after several days of losses in the wake of President Donald Trump's inaugural speech.
The dollar fell to a low against a currency basket on Monday, weighed by concerns about the early days of Donald Trump's administration.
The dollar edged lower in choppy trading on Friday as investors found few reasons to make big bets on the U.S. currency.
The dollar climbed on Thursday as solid U.S. data reinforced a theme of robust U.S. economic growth.
Investors eyed an upcoming speech by the head of the Federal Reserve and U.S. inflation data for clues on the path of interest rates.
Theresa May triggered the pound's biggest jump in eight years.
Sterling was hit by fears that Prime Minister Theresa May will say on Tuesday that Britain will lose its access to the EU single market.
The U.S. dollar gained against the yen and was little changed against the euro on Friday, rebounding from five-week lows.
There is little if any data to support suggestions that traders may have deliberately spurred October's flash crash in sterling, a BIS report said.
The dollar sank to a five-week low below 114 yen on Thursday and was on course for its worst week since November.