Ok ladies freaked out here!!TMI

Danielle
So I got my period on friday..it was very light pink and watery..Saturday was a little more regular flow..Sunday was nothing...and nothing this morning. .well me and my boy had sex this morning and after I started bleeding...no.biggie I know it happens...I put a tampon in and about two hours later was heading to grocery shop...I get out of the car and feel this gush and thank God I had a long dress on ...I look and there was a ton of blood running down my legs...I've never had that happen not even on my heaviest af days..so I get back in the car and go.home to clean up..I pull the tampon out and sit down and this thing falls out into the toilet...I'm assuming a clot...a little freaked out because I don't ever get them being my flow isn't every really heavy...well I feel this weird sensation and look down and see something else trying to come out...I catch it in toilet paper to look and it was pretty big and kinda tough ( yes I touched it ) the only thing I can think of was it looked like a sac of some kind..never seen anything like it ...I was pretty freaked out...so I cleaned up and put in another tampon and went about my day get home a few hours later and go to the bathroom and surprisingly there was no more blood at all tampon was dry and the rest of the day was dry. .so my question is. ..is this normal period stuff or has anyone else had this experience. ..I started really freaked me out...could I have miscarried and not known ?