Is my hamster in season!!!??

hamsters are always in season. I had one that had another litter before she was finished welping the first. needles to say a lot died. But normally they are very quiet when they are going to have babies. Making nice little beds. very well behaved. A heat should not bother a hamster in that way. But she could already be pregnant. can't remeber how long a hamster is pregnant for. Other than that I would almost guess something else is wrong. I would check your local library for books on hamsters.