Metformin and "phantom kicks"


started 500 mg of metformin 2 times a day for pcos and insulin resistance. my cycle was 19 days ago but for the past 4 days I've had non stop "phantom kicks" they don't stop its constant kicking feeling, feels like when your baby gets hiccups in your womb.. and i get really nauseous at night. ive had irregular cycles for awhile and have taken preg test and ovulation all Negative. anyone else experience this? its not gas these feel identical to kicks that can be seen as well. Hoping its just part of the medication but idk