Tumi,
If she is contacting you, the thing that got rid of Lu (my fiance's ex) was by basically saying that if it is his, once the dna test has been completed let us know and we will pay the maintenance.
We basically said we want nothing to do with the child (we would have done obviously) and that we would pay maintence but as far as we were concerned neither existed. If she doesnt leave you alone, I would suggest you get your bf to have this serious conversation with her, to basically say this. At the end of the day, she is his problem not yours, and although you are a couple, it sounds like you are dealing with all the stress from this.
Unfortunately men dont get effected by things like this.. but put your bf in your situation, what if you were pregnant and werent sure who the father was, im sure it would be tearing him apart.
Try not to argue with your bf, but instead sit down and have a serious conversation about it, at the end of the day, you are about to have a baby together and this isnt something you can brush under the carpet. you need to talk about it so you can deal with it like adults for the sake of you and the baby.
Hope everything is ok with you and the baby, but you really need to eat even if you cant sleep, otherwise you wont be getting the nutrients you need to help the baby develop.
Think about you and the baby and no-one else at the moment... be selfish for once and concentrate on you... you will always have you and the baby even if you have problems with men!!
please take care!
Laura