Is it meant to happen??

My husband and I are attempting to get pregnant again (we have a 3 year old son)...and after 3 years.. no luck. We are doing all the fertility treatments--- which *****. Tests, tests, and more tests. My husband works during the day, so I've pretty much been doing all this by myself. Although the time I did take the fam to the fertlility doctors app...it was a disaster. My son cried and threw a temper tantrum, then urinated on the floor while the doctor was attempting to talk to my husband and I.  I was so frustrated with everything to begin with, the stress on top of the whole fertility thing is sometimes just too much to handle. I wonder if God meant for me to only have one child. My husband thinks that is crazy thinking..and it's just my moods talking...which maybe it is. Who knows. I just know the longer this goes on and no baby- maybe it is a sign.  The I see the octo-mom...which I do see how that happens. My doctors claim they will only implant up to 3, but I am sure if were paying in cash as she was...it would be a different story. It is so expensive..and the chances of it actually working is almost a joke. It's like--- you want me to pay you HOW MUCH?? And I have to go through what, and how many appointments?? And there's a pretty good chance it won't work anyways???? Where does my money go....well you can answer that one...and it sure isn't back in my pocket that's for sure!  The whole thing is just so frustrating I could scream sometimes! Not to mention the strain between my husband and I, and our sex life is so dual. Trying to get pregnant....forplay and pleasure it out the window. It's like- I am leaving for work and you are on your lunch break...the kid is crying and the dog and cats are sitting at the end of the bed watching us...hurry up hun...lol!  Maybe it just isn't meant to be.