should i call a doctor?

i am apparently 6 days late for my period, but that could be off because i breastfeed. i have taken 4 pregnancy tests, all negative. i’ve had a BUNCH of clear “fertile like” discharge to the point it feels like water coming out or as if i’m peeing myself for the last week. but last night, i started having the worst cramps. it hurt to turn over but kept waking me up. when i got out of bed this morning, i could barely walk. it hurts to sit, it’s hurts to stand. i’m also sick and it hurts SO BAD to sneeze or cough. it’s in my pelvis area and lower back. i made a bowel movement yesterday so it’s not constipation either. i have a history of kidney stones but this feels different? it hurts so bad and i never get cramps and no sign of period so idk what it could be? i’m at home with 2 little ones and it’s hard to keep up