Thanks for the query.
Intermenstrual spotting can be seen due to causes like :
- Hormonal imbalance
- Thyroid hormonal abnormalities
- Post coital tear
- Ovulatory bleeding
As you had unprotected intercourse
around the time of ovulation, there is possibility of pregnancy.
But to come to one conclusion regarding pregnancy, better to wait till your expected date of periods.
If you miss the expected date of periods, go for blood test
If not wait for 5 more days and go for urine test for pregnancy.
Start taking folic acid
supplementation from nowonwards.