Thanks for the query.
Just by symptoms we cannot come to one conclusion regarding pregnancy.
The bleeding could be indicating onset of menstruation
or due to implantation
as you said.
It is early to diagnose the pregnancy.
If the spotting turns into bleeding, possibly that could be due to menstrual flow.
If spotting continues, on the day of your expected date of periods, go for blood test
If the test comes positive, consult gynecologist once and take tablets to control the bleeding.
After two weeks go for ultrasound
to confirm the intrauterine pregnancy and to estimate the gestational age
Restricting physical activity and taking rest can decrease the spotting to some extent.