18 weeks pregnant - feeling nauseous

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I've started feeling really nauseous again over the past couple of days.
1st trimester I had a lot of nausea, but no physical sickness, all eased at around 13 weeks but I've now started to feel nauseous again.
My bump is really starting to show now and started to feel flutters, will the movement be making me feel nauseous?
Anyone else had similar?

I realise this was posted ages ago, but I'm feeling exactly the same. 1st trimester nausea eased off at 12 weeks, but now suddenly back at 18 weeks. Hoping it doesn't last long!