I have found the M&S maternity tights and their yoga maternity leggings the best! Leggings not see through and super comfortable! X
Lovall leggings! Get the ‘maternity revitalise leggings’. I do lots of strength training and some running (little) and they are brilliant. A bit more expensive - £45, but worth it.
Lululemon, align you can wear the same size and use them after. x