Abdominal cramps.TMI.

Hi everyone I'm 17 weeks and 5 days and for the last couple of days I've had lower abdominal cramping that sends a shooting pain into my bum. Sorry tmi. But I've had no bleeding and I can feel baby still kicking around happily. I don't know if its round ligament pain, constipation or hemorrhoids or all of them? Anyone else have anything similar? Tia x