Oo normal yan sa second trimester, mama! Ang katawan natin ay sobrang init dahil ang metabolism natin tumaas at mas maraming blood flow, kaya parang laging mainit kahit sa air-con na. A few of us told me rin na pareho namin experience, isa na akong umiinit ng sobra even during night time, pero that difficulty breathing part mo, baka worth checking with your OB lang para ma-assure na okay lang, okay? Sometimes kaya ng anxiety o hormone changes pero better safe than sorry lalo na pregnant ka na, so contact your doctor na lang para sa peace of mind mo.