Hi Jennifer
I have a similar story... I had a young child at home and I was pg w/ him... That pg was very ueventful. So we had been TTC about 7 month and got a BFP.. After the lines showed up we just thought everything was fine and it never dawned on me that it couldn't. Yet, I ended up in the ER w/ bleeding and pain, I was admitted, monitored to see if the pg would terminate on it's own but had surgery to have my pg and right tube removed 2 days later when internal bleeding set in.
There is a huge range of emotion that goes w/ this, you lost a much wanted pg and you lost all the dreams you had for this baby as soon as you knew you were pg. Then... You have to deal w/ loosing a tube.. . And then you have to deal w/ the traumma of the reality of it all, surgery and the fact that yes.. You could have died, it's really scarry
There is nothing you did that caused this. I think that some past surgery "may" have contributed to my ectopic. I had a large cyst removed from my right ovary when I was younger.. and then I also had a crash c-section.. Either could have caused scarring in or around that tube. But normally, this is just something that happens and it's not your fault at all.
After my ectopic.. I did ask about an HSG but my Dr. told me that while he did the surgery he looked at my other tube and said it looked fine but.... I think my body chicked out on the baby front

and I stopped ovulating... I waited and TTC for about another year and decided to go to my Dr. for help.. After a couple months of tests I was put on low a low dose of clomid and poof.... 4 clomid cy's later.... Twins.... All w/ 1 tube I might add

And now... Well, even while I was practicing "safe sex" we got a little surprise a couple days before Christmas which came in the form of 2 lines on a pg test.
So trust me... 2 tubes... 1 tube... It does NOT matter. I know it's hard to believe now, I really do know that. I've been there, thinking pg would never happen for us again. But it does for just about everyone who's had an ectopic or lost a tube. It's obvious to me that you have no other underlaying fertility issues.. This is just a fluke for you.
Please feel better soon, and post here when ever you need too.. All the girls here are great.