15w1d and menstrual like cramps?

C •
I went to the dr yesterday and everything was perfect! Baby's heart rate was 160 and obviously very active as s/he kept moving from the Doppler. Lol 
Today I started to get these cramps like menstrual. Kinda scared me so I went to the restroom to be sure there was no spotting/bleeding. Thank God there was nothing! 🙌🏽🙏🏽
Has anyone else experienced this? Could it be I'm still stretching?