Im 5 months prego.. I look pregnant one day and the next i dont???

💋❤Kristi❤💋 • mom of 3.
Im pregnant with my 2nd kid(this one is a boy) and i am almost 20 weeks pregnant. One day i look huge!! And the next my huge bump is not there.. Wth?? I weigh almost 200 lbs so im not little. But this is driving me crazy!!!