Baby favoring left side?

Jenna • Boy 💙 2/21/17, 🌈 Baby 6/1/18 Girl 💜 Due 7/31/19

My LO seems to sleep tilted left and naturally goes that way in swing or car seat but every time she’s held up right or does Tummy time she turns her head right no problem. It’s just when shes laying down she won’t really turn her head right (only slightly). She seems tight when I try to do it manually But like I said she does it when she’s held sitting up or on my shoulder. It’s making me paranoid. Think I should go to doctor to get PT referral or just do stretches and wait to 4 month appt? I bought her a flat head pillow too. I feel it’s slightly flatter on the one side but my husband doesnt notice it and doctor didn’t say anything at her 2 month appt. ugh 😑 I get so obsessive haha