my bfp was not so positive

the past couple of weeks have been an emotional rollercoaster. i got a bfp on 9.26 with a beta of 116. the 2nd beta 2 days later went up 70% to 190. they wanted me to come back 2 days after that since i didn't double, but my increase was still in the normal range. well that's when it all went downhill. my 3rd beta went up only by 33% to 268. they asked me to come back 4 days later for a 4th beta. this was monday. i did the blood draw that afternoon & the re did an ultrasound. there was nothing there. he is thinking it's either a chemical pregnancy with a miscarriage to come or an ectopic. i hope it's not an ectopic since due to the medicine i'd need to stop the ectopic pregnancy i wouldn't be able to start a new ivf/icsi cycle for 2 months. we want to move on & start as soon as possible. if i have a miscarriahe we could start right away. since this was my 1st ivf/icsi & i got a bfp originally i was so excited....now i'm a melting pot of emotions....
so i got a call yesterday & was told my # from monday did go up to 345. this possibly means an ectopic pregnancy. i was told to come back today. so i took a sick day from school. i went in for MORE bloodwork today & going back at 1pm for an ultrasound & a possible injection of methotrexate to stop the ectopic pregnancy if that's what the re believes it to be. i hope the injection works, as i've read that sometimes women require 2 or 3 shots. surgery would be the last resort.
the worst part of it all we can't start a new cycle for 2 months minimum since the medication stays in the body for a few months. the good thing is i have phenomenal insurance through my school district so i have no max.
i have to have the outlook that everything happens for a reason & stay positive so the outcome of my next ivf treatment isn't negatively affected.
good luck to everyone!!! i know there are new ladies on here & just so you know i have been reading all of your stories & i wish you all nothing but the best. i will definitely pop back in here & hopefully soon start writing about my next ivf cycle.