You can test earliest a week after having sex though ideally, you should wait till you miss your period. It remains positive by first trimester.
This sounds like Bacterial Vaginosis (BV). It is a very common bacterial infection and is not sexually transmitted.
Ideally, you should obtain a prescription for an antibiotic known as Metronidazole (Flagyl) from your physician or Urgent Care. However, if that is not possible, given the circumstances, I will suggest that you use Boric acid suppositories, these are over the counter and you have to place one intravaginally every night before you go to bed for 3 days in a row and then one every week for 6 weeks and abstain from sexual intercourse during the first 3 days and then for 24 hours after you place the suppository every week.
You can also use 5 to 10 drops of tea tree oil mixed with an ounce of coconut oil, soak a tampon in it and place that tampon in the vagina for 30 minutes and then remove it. Do this for 4 to 5 days.
Both these measures will alleviate your symptoms.
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