My 3 month old sleeping pattern is messed up!?

My daughter is 3 months and she use to sleep through the night (10pm-4:30 or 5 am). For the past week she has been waking up about 1 hour after I put her in her binet. Lately the only way for me to get some sleep is to put her in her bouncer and bounce her back to sleep. Why is she being like this? She isn't sick, she doesn't seem gy, and I don't think she is teething yet. Do you think this will p if I keep up her normal bedtime routine?