Bloating after Plan b?

Going back on the birth control and or the plan b can have side effects . If you took the plan b within 24 hours of intercourse and you then started your period a week later then chances of you being pregnant are slim to none . I would say you shouldn't worry about being pregnant suddenly stopping and starting the birth control can mess up your system and many woman do get bloated and or can gain a lot of weight from taking birth control . And plan b can have major side effects on the body as well. If your period doesn't come when it's expected give it another week or 2 or even a month , if nothing then you should see a doctor , but your body could just need some time to recover , reset, and regulate itself again . And maybe a heating pad for the bloating

It's unlikely that the bleeding you just had was your period. Plan B can cause bleeding after use, & then can delay your actual period by a week or two. It depends where you were in your cycle when you used Plan B as to what symptoms you get. You've done the right thing continuing with your birth control the way you would have done had you not taken Plan B.

Plan B is a big dose of hormone, & can cause all sorts of hormonal symptoms, of which bloating is one.
There are a few things you can do to ease possible causes of bloating, or ease the symptoms until your hormones settle down again.

Peppermint tea is good.
Drinking lots of water to ensure you are hydrated enough to prevent constipation is also very important. Few people drink as much as we are meant to, to keep our bowel & other organs functioning at the intended rate..
A colonic irrigation/colonic hydrotherapy would help if you were constipated, too. If you were prepared to spend a little more.

If the bloating is due to fluid retention because of hormones, then drinking lots of water will also help with this. Ensure your urine is as light coloured as possible. The darker it is, the more you need to drink.
Stay away from caffeinated drinks (tea, coffee, cola etc).

I do not think you are pregnant. You have taken Plan B correctly & continued with your birth control correctly.