DCA Question

I am a novice and enjoy buying stocks. I have about 15 companies I like and started buying in November. I DCA each week and occasionally add a new position if something I like hits a price target.

I stick to a weekly budget and add shares once each week. Its easier for me to add everything on one day, rather than some stocks today and some tomorrow. This may be a dumb question, but am I better picking a set day like Wednesday or trying to buy on a red day like I do now. I usually feel like I buy the wrong day.

Thanks.