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How far along are you (what trimester?)
Well as you may already know oral health changes significantly when you are pregnant. The fluctuations in hormones are very challenging for the gingival (gum tisuses). Pregnant women are more prone to develop gingival conditions, even gingival abscesses. So what I'm thinking is your recession may be a factor associated with your pregnancy. I would schedule a dental cleaning/exam. A cleaning is safe to facilitate during the 3rd trimester and its good to get the tooth surfaces clean of tarter buildup, since after baby you might have a harder time getting to your dentist appointments.
Honestly I would attempt to go to another office just to obtain a cleaning. In the interim though I would continue your brushing routine, but brush softly. Brushing hard or harder does no good at removing more plaque. You could also upgrade to a electric toothbrush if you typically use a manual brush. Both sonicare and oral b triumph are great electric brushes that will make SURE you don't brush too hard, while removing plaque even more effectively from the gum line. If you don't currently use a mouthrinse, an antibacterial rinse would greatly benefit you during this hormonal time. Swish for 1 minute and spit after brushing. In addition to hygiene complications that occur during pregnancy, the other thing to keep in mind is that gum recession can progress if you tend to clench or grind your teeth. Some individuals do this during the day during stress, or others unconsciously at night. If you are a night clencher it would be wise to implement a mouth guard/splint to protect the teeth from the pressure of clenching or grinding. Your dentist would have to make this appliance for you, but since its a wait to get in to your office you could look into makeshift temporary options that are usually available at drugstores (boil guard and bite type appliance). Does this make sense and help you?
Alcohol free is best as long as its still labeled an antibacterial rinse. The spot were the gum is loose, again just gently brush either manual or with electric brush in the area by tilting the bristles towards the sulcus (under gumline) to sweet plaque and debris out. If you can find a plastic irrigating syringe at a drug store you can use that to flush the pocket with the rinse after the brushing. After 10-14 days the area may start to tighten up a little, but it may not completely re-attach with out antibiotic treatment (that your dentist would place local at the site).
No there really isn't anything in particular that would create a worsening of the situation. Really crunchy foods that are hard, like kettle chips that could cause injury might want to be avoided or thinks like popcorn or fruits with seeds that can get stuck easier under the sulcus.
If there isn't anything else you want to ask, if you would please provide a rating so I can close our conversation, thanks.