Pregnancy after Nexplanon

Hi guys, so I took out my nexplanon on Sept. 21 and had a short cycle after (I thought I was pregnant but was not) followed by a very short period for me (only two days). Now I’m trying again but I’m a little confused and frustrated. I’m trying to use opk tests to time my ovulation, but it’s been 2-3 days past when I should have peaked and I’ve only gotten negative tests (they went from no line, to a ghost line, but still no positive test). My symptoms seem to be all over the place, the past couple of days I’ve felt very gassy and bloated, and this morning I woke up to a lot of whitish watery cm, but again no peak on the opk tests. I’m wondering if anyone else has had experience TTC after nexplanon and might be able to offer me some guidance? So far I feel like I’m just confusing myself. Thanks