A: I would hope not! That would be a catastrophe out at sea!
Seriously, it’s very rare but I suppose it’s theoretically possible. Anything is theoretically possible. Theoretically I could catch a mermaid one day. For most people though, I’d say no. Omega-3’s have been shown to be beneficial for digestion. If it does bother your stomach in any way, try splitting up the dose and taking it with food. Say one with breakfast and one with lunch.