L.,
I am going on my 4th month of pregnancy. I can COMPLETELY understand what you mean by forgetting what is "normal" and what isn't! My youngest child is 10 years old. I'm only 31, but considering my daughter was born 10 years ago, I really didn't think that I would be doing this again! Anyway, a few weeks ago I started feeling a LOT of pressure. I'm talking the kind of pressure I remember having when I was almost full term before. I was pretty conserned and started looking up info on the computer. There seemed to be a lot of information about cramping during my search and what it said was that it was very normal to have light cramping (kind of like when you're about to start your cycle) because your body isn't quite figured out you're carrying a baby now.
If it were me, if I wasn't cramping very much, I wouldn't think too much about it (only because you're not bleeding). If you're having any kind of discharge or your cramps are more than light, I would contact my doctor.
That's just my thoughts. I think it's best to go with your gut.
Anyway, hope everything works out!! Congratulations!
K.