Karamihan ng mga kaibigan ko na pregnant din noon, ganyan din nangyari, nagsimula sa sore throat tapos naging full-blown cold with cough, at it took a good week or two bago talaga tumaas ang galing nila, kaya valid ang frustration mo. Definitely check with your OB sa next appointment mo kasi siya lang ang makakareseta ng safe antibiotics for pregnancy if kailangan talaga, pero sometimes sobrang phlegm and swelling ay tumatagal talaga even with home remedies, one of my mum friends said she gargled with salt water every few hours (like every 2-3 hours) and that helped her recover faster. The honey, lemon, and ginger approach mo is really good, just make sure you're staying super hydrated and resting as much as you can kasi ang immunity talaga ay a bit compromised when preggers. Pero honestly, I'd reach out to your OB clinic now if you can, kahit may kailan pang few days, matanong mo kung okay lang ba na mag-Strepsil or other throat lozenges in the meantime, o if they want you to come in earlier. Sending healing vibes, this too shall pass!