Wa'alaikumassalam warahmatullahi wabarakatuh, sayang!
Sesak nafas di 25 minggu tu memang sangat common, jadi jangan risau sangat. Most mums experience this around second trimester onwards sebab hormones, progesteron especially, affect your breathing pattern, plus the uterus semakin besar so it takes up more space, kalau faham maksud saya. My neighbour went through exactly the same thing at your stage, dan doctor dia kata it's totally normal.
That said, kalau rasa dizzy, chest pain, atau nafas sangat tersekat sampai tak boleh cakap proper sentences, memang worth checking dengan doctor atau specialist you, just to be on the safe side and get peace of mind. Take it easy, rest when you can, dan hopefully it settles a bit once baby positions differently. All the best with your pregnancy!
is²tan