Last night. Oh the pain!!!

Melissa • Mummy to two coming 3 (due August) beautiful children.
Around 4 this morning i was woke up with seriously sharp sharp stabbing pains in my left side. The pain became so intense i started to over panic i was acc going to misscarry. Im 15w along with very healthy wee baby. But when i read online about pains i was getting panicked as people where saying it could be a ruptured placenta and to phone 911 asap. Lol. While otheres where saying keep calm its a ligament stretching due to your growing womb. I havent experienced this before and it took a long long time to settle. Has anyone else ever had this and know what it is?? Is it anything to worry about?