Pregnancy Spotting

I am 19 and am NOT ready for a child. I missed my period and i have this sensation in my left lower abdomen that is nothing like my pre period cramps/period cramps. It does not hurt but i notice it. I took a pregnancy test after lunch about a week ago and it came out negative so i’m starting to worry that the missed period and these cramps are something more serious
Mostly i would just like to know if any of you experienced this same sensation during pregnancy.
thank you ladies!!

I get cramps throughout the day and night. Sometimes more painful then others. Sometimes lasting from 5-10 seconds, sometimes up to 30 seconds. Sometimes they feel like full blown period cramps, but they don’t last long. Sometimes they barely bother me at all. I am about 6 weeks pregnant. I am going to a free clinic tomorrow.. But, is it normal? (No bleeding, of course.)

I think that I might be pregnant. This morning, a little bit after I woke up, I started experiencing some cramping. The cramps felt like that of period cramps but they weren’t near as painful. They were more just uncomfortable than anything. I’ve heard of pregnant women experiencing cramping early on so I was just wondering how early or when does this happen?