Hello! I have been through your question. Related your concern I think you should know that pilonidal abscess is very rare and the cause of pilonidal abscess can be related to the deeper penetration of the hair into the subcutaneous tissues. This pathology has a good prognosis especially if the treatment start early. It is a good news that you are trying to keep this clean and making a home drainage but please you must use sterile bandage not paper towel (because this is not sterile and can make it worse).What I suggest for you in this delicate moment( pregnancy) is to keep the place sterile, washing with soap time after time the place, using iodex ointment, meet an Infectious disease doctor and surgeon to do a physical examination, take a culture from the abscess and start oral antibiotic treatment (amoxicillin or ampicillin if you aren t allergic and are allowed to use during pregnancy) and to define if need a specialised surgical drainage or intervent. I hope my answer help you. I wish you a quick recovery and healthy pregnancy.