PLEASE HELP ME!! I'M FREAKING OUT!!

Mindy
so I usually start my period around the 22nd, well about 2 months ago it started happening on the 26th, well around the 26th I started getting lower sharp pains on my left side. Hurt to cough, stand up, bring my knees to my chest, ect. But I never started my period, I haven't had sex in a long time so it couldn't be possible, I've had a regular period since and I don't feel nothing moving around in my stomach. But the pain offcially went away this weekend, it just kind of faded through the days, still no period.. 5 days late now.. has anyone went through this? Please help!!!