maybe tmi? i need your input.

Okay, this may be tmi, but I'm not sure what's going on, maybe someone has some answers... (My child is 9 months) i'm over 20 days late for my period, took multiple (over 10) pregnancy tests, all negative... Well, me and my SO were having sex and after I orgasmed, and he pulled out, I got this excruciating pain that started in my lower stomach and traveled up to my ribs and back. It made me sick to my stomach and I vomited, I could hardly walk to the bathroom and it hurt to breathe. The pain lasted for a good hour and then I took a hot bath that eased it some. I finally just fell asleep because the pain was too much, and I woke up and it is still there, although much duller. Has this happened to any of you or does any of you have any idea what's going on?