Aww, yan talaga ang kilig part ng pregnancy, pero understandable na nag-aalala ka! 7 months and 10 days pa lang siya, so active movements every few seconds ay usually normal, ang mga bata namin dito sa belly ay laging gumagalaw at nag-stretch, especially pag relaxed ka. The tightening (naninigas) you're feeling is probably Braxton Hicks, which is super common around this stage and usually walang problema, but since you're a bit concerned about the frequency, mas better na i-mention mo sa OB mo sa next check-up lang para ma-ease your mind completely, ate, doctors like to hear these things kasi alam nila exactly kung normal pa ba or may kailangan i-adjust sa monitoring mo.