If someone knows what this is please help

Arielle

So some guy came inside me a couple months back, I’m not on birth control so I took the morning after pill the next morning. A few days later I had 2 days of very light bleeding. My next period cycle went through and my period was again 2 days very light (normally mines like 5 days sorta heavy). My period was supposed to come 2 weeks ago now and I’ve had zero bleeding. But since it was supposed to come, everyday I’ve been having random short stomach pains, nothing bad but noticeable. I’ve taken 3 pregnancy tests at different times and they all came back negative. Idk if I should be worried or idk what this is, if anyone has experienced this or knows what it might be please send your thoughts. Thank you so much!!