Hi my daughter is 33 weeks and 4 days pregnant and has been experiencing pressure?

Hi my daughter is 33 weeks and 4 days pregnant and she has been experiencing pressure down low for the last 5 days or so she cant sit upright properly and has to sit back while this happens. This is her second baby and she cant remember having this feeling with her first son although he was breech right up until38/39 weeks. This baby has been head down since 32 weeks. She has the midwife on thursday when she will be 34 weeks. Is this feeling normal