I understand the dilemma for anyone who is somewhat brand new to bitcoin accumulation and feeling stuck in terms of buying now versus waiting, and from my perspective buying now is a better strategy, even though surely even with weekly buying periods, there could be ways to try to buy dips during the week or alternatively just to have a set day of the week that buys take place without getting overly preoccupied about the price but instead just having systems in place that facilitate continuous building of the personal bitcoin stack.
It is possible and fun to kind of try predicting dips within your buying period and you might be lucky enough to get more quantities at yet the same price. If for example, your buying amount is available at the start of the week, you could set some buy orders at some presumed dip prices with respect to market fluctuations and it is very possible the prices would cut through and your buy orders gets executed. In the scenario that the buy order was not executed throughout the week, then it is your duty as a disciplined and committed investor to buy at the current price at the end of the week in order to fulfill your weekly purchase obligations.