Antibiotic - 3w-4days preg

I just found out that I'm pregnant a couple of days ago. Period isn't due until Wednesday. Last week I finished a week of antibiotics from a UTI. Yesterday I thought I felt some burning so I went to the doctor and also told them about the positive test. They did a quick UTI test that came negative but they're sending it to the lab and told me to start taking amoxicillin right away. I took it yesterday but I'm nervous to continue being so newly pregnant and them not even begin sure I have a UTI. I don't have an obgyn to even ask yet. Should I stop taking it and find one to call tomorrow or should I continue to take it today and find someone to call tomorrow???