I would use the 5AM temp from yesterday. Taking your temp at the same time every day is probably more important than any other factor. Disturbances are kinda tricky. Basically, it's something that happens that is reasonably likely to have affected your temperature. My charts (on paper, so I can write whatever I want) have a lot of question marks in the disturbed section. Really, if it's not near your temperature shift, it's not going to matter.
Mouth breathing will almost certainly affect your temps because it lowers the temperature of your mouth. If you have been breathing through your mouth every day, you may have missed your thermal shift because all your temps are artificially low. If mouth breathing is a chronic problem for you, you may need to temp vaginally to get accurate temperatures. However, because your temps are so consistent, I think that it is unlikely that mouth breathing has been a significant problem. Disturbed temperatures tend to be all over the place, not clustered in the same area.
I wouldn't mark normal sleep (for you) as disturbed, though some women have a difficult time charting with their normal sleep pattern as discussed above. I would make a note if a night was especially bad, but it's hard to tell how bad it needs to get before it's going to start causing charting problems.
With stress as with sleep, we all experience a certain normal range of stress, and it's hard to know how much will affect our cycles. Stress will normally not disturb individual temperatures as much as it may delay ovulation. A major stress just as you were trying to ovulate could make your body stop in its tracks and try again later. It is possible that if your stress on the 31st was major enough, that could be why your CM reduced without apparent ovulation a few days later, or it could be something entirely different. If your stress inhibited your sleep, that could have affected your temperature the next day. Since your temp the next day is the lowest temp around, it seems possible that something may have affected it. In the end, though, it doesn't matter since it's not near your shift.
With drinking, one drink is not likely to cause a disturbance. With "a few" drinks, it depends on the woman, but it may affect the next day's temperature. Since the next day's temperature is in the same range as those around it, i wouldn't worry about it.
The tricky part with disturbances comes more when you're trying to see your thermal shift. If you think that an upper temperature may have been artificially inflated due to something that happened, be extra careful there, because you don't want to assume you are done with being fertile when something else is making it seem that way. In that case, you can't really look and see if your temp is in the range as the other temps around because you're trying to figure out if your temps are different than the ones that came before.
In any case, it sounds like you likely have not yet ovulated, but realize that sperm are likely to live 5 days (up to 7 days is possible) if you have any CM, so assuming that you might ovulate in the next week, you need to assume that you are potentially fertile. Ovulation is likely just delayed as your hormones regulate after birth and hormonal contraception. This will get easier with fewer potentially fertile days as your body finds its rhythm. Be patient with yourself this cycle.