How to build up probiotics?

I bought PB8 from Nutrition Now, 14 billion about a week and a half ago. I started off small. I take half a capsule in the morning and the other half at night. its worked okay but I took a bigger dose and was bloated. I dont understand. its been almost two weeks of the same dosing and my body still isnt used to it? Im completely lost about how to take probiotics. I heard you have to build up to a higher strain of bacteria, so that why I split it up.
Is there a time ratio of how long it would take to get to 14 billion all at one time or what? probiotics are confusing.. Tweet