You can't. Sometimes a doctor can from a pelvic exam. If it wasn't a normal period - as in the flow being lighter and not lasting as long then pregnancy is still possible so you would need to take a pregnancy test with first morning urine to determine if you're pregnant or not.
How exactly would I be able to determine if its vaginal bleeding? Bc my period wasnt normal....
No, you can't be pregnant and still have a normal period. Some women experience vaginal bleeding when pregnant - but it's not a period and usually the flow is different than a normal period.
Symptoms don't determine pregnancy, so just because you feel certain things - it doesn't mean you're pregnant and can be caused by other things. If you still suspect you could be pregnant then take a pregnancy test with first morning urine, but I would say it's unlikely you are if your period was normal.
Yes, you could be pregnant and an egg was already released before you had sex. However, you could also just be experiencing changes in your menstrual cycle, because they change as we grow older. Can you respond to my question (Title: Could I Be Pregnant???) as well? It would be greatly appreciated :)