Infection has to be drained out. Some antibiotics are contraindicated in first trimeste due to development of the fetus. Ur in 22nd week Pls consult ur gynaecologist for a clinical setting in case u can get urself administered narrow spectrum antibiotic as it’s safe and if the hospital does provide emergency dental treatment then it’s fine. U can check the tooth and get an access opening done ( root canal therapy)

Try google to find dental clinic in your city . With out examination difficult to give medicines. Pain will subside only after dental treatment

Use clove oil in the effected area. your pain will be reduce and go to nearest clinic for further treatment.

Do not apply heat or pressure on the swelling. Keep the oral cavity clean and continue warm salt water rinses - 3 or 4 times a day. Sleep on the opposite side of the swelling. Complete the antibiotics dosage given by the gynaec. If the swelling increases or does not decrease even after 2 days please go to a clinic. Many dental clinics are open in every city, just find out through Google or visit a hospital. Most hospitals have dental departments where they can take up any emergency treatment.