Hi Hayles
I am also stressing much more this time (I think )than last time that something will go wrong. I think it is bc I am much more aware of what can happen...
I have also had niggles and 'twangs' but I think with anything serious it would be more constant...
i think it is easy to come up with these scenarios in our minds when you put things together.
IMO with an ectopic you would have the shoulder pain AFTER other symptoms as it is referred pain - i am not sure though.
I honestly think it is nothing to worry about but if you are really worried in a day or so then go get checked - it cant hurtand will give you peace of mind.