The ad for the band I bought says that it can help women stay in pre-baby jeans for the duration of their pregnancy. Is this true? I feel like the jeans with the band are getting really snug and I haven't gained much weight so I'm trying to see if I need to budget for maternity pants now. I'm 14 weeks and I thought maybe it's because of where my uterus is positioned now. If the uterus grows and goes a little higher will the pre-baby jeans with the band start to fit again?