Ttc, ovulation, depo

Hello 🙂 i am nearly 24 & I have been on contraception for 10 years, swapping between ‘the pill’ and the depo shot. In January 2017 i stopped taking my pill and was conception free until end of may 2017 when i had a depo shot. The depo shot was due to run out in august 2017- though out june and july i had light spotting for two weeks, and then after august i had 3 days of brown thick blood. After that i had nothing til until January 2018! On the 1st on Jan I decided to take x2 Vitex agnus castus vitamins- two days later i had my first proper period! It lasted from the 3rd until the 9th/10th of January (which is a long period for me- usually i only bleed 4/5 days). My partner and i are now TTC and ive been taking OPKs and am yet to have a positive! I am currently on CD15 and according to my apps im fertile and due to ovulate on the 20th! So far ive had no signs of ovulation! Any of you lovelys in the same boat?