Hi everyone. Just wanted to give you a bit of an update as you've been so kind, asking after me :)
I came for my scan at EPU on Tuesday. They still couldn't see anything but with my hCG continuing to rise suboptimally they were concerned about ectopic so I was admitted as an emergency for a laparoscopy that day. Unfortunately the procedure had to be abandoned (meant to be 40 mins, took several hours and they brought in a second consultant 
) because they just couldn't see what they needed to and they decided to avoid doing a bigger procedure (laparotomy) at that time. They discussed my options which were to have yet another scan, then to have methotrexate or to go for the laparotomy depending on what it showed, but the particular doctor they wanted to scan me wasn't going to be in until Friday so I'd have to stay in. They were afraid to let me go home in case of rupture (although I still had no pain or bleeding or anything). I was really frustrated because they were talking about treating something they couldn't see so it was totally blind. At this point I was still thinking maybe my dates were too early. I really really wanted to avoid more surgery if at all possible and wasn't super keen on methotrexate as it means you can't TTC for 3-6 months and we've been trying 2 years (and I'm 38).
They changed their minds about the plan and I had an MRI yesterday. Intially they told me that it was in the uterus but at the end of the fallopian so it wouldn't be able to grow properly, but they couldn't be completely certain that it wasn't viable. Friday (this) morning though they said that actually it showed that the pregnancy was in the muscle layer of the uterus. Very risky place as so many blood vessels and rupture could have been catastrophic. Turns out there's a less than 1 in 10000 chance of this kind of ectopic happening!
They felt the risk of failure with methotrexate was too high and the safest option was planned surgery (but ASAP) rather than potentially needing emergency surgery.
So this afternoon I had a laparotomy. I'm waiting for the surgeon to debrief me about the procedure but I've been told by the theatre staff that it was very successful and they were able to keep my tube (although, interestingly, if they'd taken it it would only decrease fertility by a small amount, like 10%, as the other tube can pick up eggs from both ovaries). My fertility after this operation isn't affected and the only thing is if I get pregnant again that I'd need early scans and wouldn't be able to deliver vaginally, I'd have to have a section. I'm a bit sad about that but maybe some of you ladies who've had vaginal births will tell me that's a silly worry 
I think I'll be in hospital for another couple of days and then the recovery period is something like 6 weeks of not being able to drive or do any lifting. So I'll be off work for a bit.
If I'm to look for any bright sides here, I guess it's that it was only by chance that I decided to do a pregnancy test after having a positive ovulation stick a few days after my period, and it was only because I used my March period instead of the April one that they dated me at 6 weeks and I was able to have a scan. The bleeding that prompted the scan was really only very light and stopped the same day, so I could easily not have been allowed it. Essentially I could have been sitting at home/work with zero clue that I was pregnant with an extremely risky ectopic until it ruptured, and I could have had absolutely catastrophic internal bleeding, maybe even died. So the whole sequence of events despite the incredible bad luck of the ectopic was also very lucky in a way. It's the only way I'm mentally getting through this, anyway!
Sorry for the long message, just thought I would say it all in one go as I don't think I'll be posting again 
Best of luck to all of you ladies for the next months xxx