I had my period on time and it was heavy the 1st day but the next it was light could I be carrying a baby

Very unlikely. It's possible to be pregnant if you have spotting, or a very light bleed, but a heavy bleed usually means it's a normal period. You probably had a light day because you just had a heavy one.

I'm going through the same thing! My period was late! 2 months late! Then I finally got it and it was heavy the first day or 2.. and then it got lighter! Thought I was pregnant! But I took 5 pregnancy tests.. all came up negative.. maybe you were just stressed? I know I was because I kept thinking I was pregnant. If you have no other symptoms of being pregnant.. than I wouldn't worry about it. You probably just had an off month.. we all do. But if it continues I would go to see the doctor to get on birth control if your periods are irregular or acting funny.

The first day of my period was kind of heavy , when I first peed a blood clot came out and the second day was normal but the third and fourth almost nothing I'm worried... could I be pregnant? I have cramping too something that rarely happens to me.
I had sex for the first time like three weeks ago

The first two days my period was light then later on that day it started getting heavy with clots never happen to me before so I'm not sure exactly what it means or how to take it?