Sleep Regression???

Tiara

My LO will be 4 months on the 9th. Up until now I rocked her to sleep, attempting drowsy but awake. It would take me 15 minutes to get her to sleep. Now it takes me 30 minutes+. When I lay her in her crib she wakes up right away and cries. She whines in my arms and seems to have trouble just falling asleep in my arms. Is this the start of the 4 month regression? What did you go through??? Just curious!