Yep, totally normal yan sa 7 months, mama! The heaviness is usually from the baby getting bigger plus the extra fluids and weight down there, a few of us felt the same thing, parang may bato sa tummy haha. The frequent peeing is also just the baby pressing on your bladder, so annoying right? But since you're not experiencing pain, that's a good sign. Still, I'd suggest mentioning it to your OB sa next check-up lang, just to be safe and for peace of mind, mas better na, lalo na kung nag-worryworry ka na. In the meantime, try to rest with your feet up pag kaya, and wear comfy maternity clothes so you feel a bit lighter!