I missed my period in december but in january I had it from the 4gh till the 10th when am I due to ovulate my tracker says the 29th?

Need to know. Your usual cycle length (ex: 28 days) and how regular you are to answer this.
Unsure. We need more information to answer your question accurately. However, essentially all women ovulate 14 days before their period starts. When the period starts, women with normal cycles will ovulate anytime from 7 to 21 days later. So cycle length helps to predict ovulation. If your cycles are 21 days long, you should ovulate about january 11, with 28 day cycles ovulation would be due jan 18.