Hello! 15 weeks pregnant, the last 2-3 days something low in the belly…

Hello! 15 weeks pregnant, the last 2-3 days something low in the belly like strange pain, and the waist is pulling altogether normal, as you think, and I also sleep very badly at night. ??like it hurts, like I don't know some kind of feeling, and generally, tingling, what trimester, on what week happens