TTC questions.

Dom💕
hi everyone! me and my SO are trying to convince our 2nd child. i just got my nexplanon out on the 8th of this month. and i started my period on the 6th and it ended on the 10th. we attempted on the 11th and 12th. i have bought an ovulation test pack and it says that i'm not fertile but i still plan on taking a test in about less than 2 weeks. i know we have just started but i'm very nervous that it will come back negative.