Right Before Period Is It Possible To Conceive Right Before You Start Your Period?

Is it possible to conceive right before you start your period? - right before period

I had a normal period, then right after, I felt symptoms of pregnancy for 2 weeks, especially now, such as nausea, always hungry, constipated (TMI!) And now it could not stand or standing for long periods, because my body was so tired.

Is it possible that the idea came to me before my time, not more difficult than ever before?