So the test that you took yesterday was it positive or negative? If you do not have an accurate test that has not said for sure that you are pregnant but you are conviced or stressed that you are then sometimes our body can throw off symptoms that make you feel that you are even missed periods. Now for the other symptoms it is normal to feel some cramping with pregnancy because your internal body is going through so many different changes. Things are moving around to make room. For the baloon feeling in a way it is kind of like that specially if your a small framed person you will have wierd feeling in the abdomen area as you grow larger. Now it is very important to get in to get an accurate test done to get the positive so that you can prepare for the months a head but if the answere is negative then you need to find out if there is something else going on inside. I had similar symptoms except instead of a missed perid I had one that only lasted 3 days and was extremly light which was not normal for me. I went into the doctor to find out I had displasia growing on the cervix (they said this is canceres cells) they have to remove this before it grows into cancer and this can be a small amount or large amount and depending on the severity depended on what kind of treatment would be needed. I ended up pregnant before they had the results back of this diagnoses so they were very worried about what might happen through the pregnancy and they kept a real close eye on it through the nine months. Lucky for me it was such a small amount that when in labor it had miraculously disappeared and hasn't come back that was 8 years ago and the doctor is still very shocked that it just went away but still keeps a very close eye on it to make sure that it does not come back because it could cause alot of damage. Sorry for such a long response I hope all goes well for you. Good luck and I hope I have been of some help.