Hey mama, congrats on 4 months! Yes, round ligament pain is totally a thing, that sharp or achy feeling sa hips, groin, or sides kapag gumagalaw ka suddenly or tumataas from lying down, super common yan sa second trimester onwards kaya that could definitely be it! As for the hiccups, yep, babies do get the hiccups in the womb and you'll feel it as repeated little thumps or rhythmic movements sa belly, it's actually a good sign, pero if you're worried about anything or the pain gets really intense, best to check with your OB para sure lang. A few of us moms found that changing positions slowly, avoiding sudden movements, at wearing a maternity support belt really helped with that ligament pain, so give it a try! Congrats ulit, you're doing great!