Job offers and tight pants.

It is cold here today... a chilly 4 C outside, but rather than sensibly wearing pants that covered my legs I am in a sun dress and jacket because my pants were just not comfortable wearing them today.  I am choosing to believe that this is because my belly is starting to bloat (and not because I ate too much fast food on our drive to New York last weekend).  It has taken me by surprise how quickly this happened.  Suddenly buying maternity clothes last weekend doesn't seem like quite as early as it did.  I am surprised at how quickly this has come up.  I mean I can still fit in them... but not comfortably. And it was so flustered because we were running late that I just tore off the pants and grabbed the first dress that I saw. I am starting week 8 today. 

In other news my current contract is due to expire at the end of July.  My boss had mentioned to me that he wanted to extend it for a year... the man has his shit together because I got handed a new contract this week.  The good news is that he likes me enough to keep me around... the bad news is that I feel compelled to tell him about my pregnancy before i sign the new contract.  I know that legally I am not required to tell him, and believe me if the man was any sort of bad boss i wouldn't tell him, but i do feel compelled to let him know because he has been so kind and respectful of me and so helpful and wonderful to work for.  I in no way expect this to affect the terms of the contract. 

I think it is way, way, way too early to share this sort of thing with your boss... that's the only problem.  There still like a 10% chance that this pregnancy will not make it to happy healthy baby.  And as much as I like my boss I don't know if I want to discuss all of the details.  However, i am supposed to sign my contract by Monday.  So I don't really know what else to do. 

Any advice?