missed period making TTC tricky

My partner and I have been planning to start TTC next month. In preparation I had my implanon removed 7 months ago and have been tracking my period with glow since. It has been very consistent for the past 6 months but this month my period is a week late. The chance of pregnancy is very low and I have been dieting and lost about 3kg during the month. I'm worried now that next month when we want to start trying my tracking has been messed up and it will be hard to pin point when I'm ovulating, any advice? Thanks!