DS2 was breech till about 35 weeks and I could feel his head under my right ribcage, very uncomfortable! It was a hard round lump and felt quite different to what it's bottom would have felt like, and I also felt him pushing off on my left hip with his feet!

You could ask your obs or midwife to check the baby's position for you. I asked and was told not to worry that he was breech until after 36 weeks, as it is very common for subsequent babies to 'float' around for longer than first babies.
All the best for you VBA2C!