Frustrating

So my husband and I are currently TTC baby #2 and it's been rather difficult this go around. A little back story....

I have been on birth control since I was 15 and I'll turn 26 in a couple months. I have been on so many different birth controls but since I was 19 I've been on the arm implant. (First one was implanon second one was nexplanon) I had my implant removed May 2nd. My husband works away from home so I knew this was gonna take some planning for the right time. I have been tracking my period using the glow app since April. So far it's been on time every month since then except for this month. My husband was home during my predicted ovulation and of course the deed was done. He was also home the week before and the week after so we pretty much had it covered in case the prediction was wrong hahaha. Anyways I was supposed to start my period on the 15th and it still hasn't came but my pregnancy test are showing negative. Could I have ovulated later than what was predicted and actually be pregnant or am I just wishing to hard? Both of us are getting so discouraged because it literally took 1 try to get pregnant the first time and now it seems almost impossible.