Hello
Thanks for posting your query at DoctorSpring.com
I think this is your normal period.
Pregnancy is not likely.
Once ina while, a period might be preceded and followed by some spotting.
Anxiety, stress, exercise, weight changes, late nights, smoking, drinking, travelling - all of these can impact your cycle.
So just maintain a menstrual diary detailing the dates.
IF the spotting persists or recurs next month too, you should consult an OB - GYN and go for an internal exam, Pap Smear, Pelvic ultrasound scan and hormonal levels ( FSH, LH, TSH, prolactin ).
Else do not worry about spotting that happens once in a while.
All the best
Please feel free to discuss further.