I had an unprotected sex in October.November 16, 2017, is my last period date. After that period I’ve not had sex or missed a period since November. C
Dr Fabusuyi G.I

Medical Doctor at Ekiti Teaching Hospital

Can you still get pregnant?, "YES". So cheers!!!.
Dr Fabusuyi G.I

Medical Doctor at Ekiti Teaching Hospital

If this is the case, it implies that you had the safe on your "safe period". That's why you're not pregnant then and still seeing you period to now.
Dr Fabusuyi G.I

Medical Doctor at Ekiti Teaching Hospital

If I get your question well. You had unprotected sex in october and You've not missed your period since then. i.e you still saw your period last month.