Please help

MaKayla • 21• Married to my Middle school Sweetheart! • PCOS • due with #1 on 07/01/2020

I’m 19 weeks 3 days (after midnight) I just was laying in bed and I kinda got this feeling like someone was pinching me inside ? It only lasted a minute or so but ? What was it . If you can think what it would feel like if a dr reached in there and pinched you that’s what it was . I am concerned no bleeding or any other pain and it has went away but ???