Hcg levels after ectopic

J
Hello,
I had methodraxate after finding out o had an ectopic pregnancy. On day 4 my levels had dropped and again on day 7. However I went back yesterday and they had risen from 194 to 276. 
I know they are low but I'm concerned as to why they have risen. 
My history is:
151
126
542
358
194
276
I have to go back to the hospital tomorrow but am worried as I don't know what they will do. Also I'm due to be getting a flight on Wednesday morning and I don't want to have to cancel. I've had enough heartache, this is my 4th pregnancy, and I have no children. 
I know some people may read this and think we'll it's so low it's not worth worrying about and not bother to reply, but please if anyone has expericenced this or similar please post a rely. 
I'm so anxious and scared. I did not have the surgery instead I opted for the medical. 
Thanks