See this IRS website for information - https://www.irs.gov/Affordable-Care-Act/Individuals-and-Families/Questions-and-Answers-on-the-Indivi...
20. If I change health coverage during the year and end up with a gap when I am not covered, will I owe a payment?
Individuals are treated as having minimum essential coverage for a calendar month if they have coverage for at least one day during that month. Additionally, as long as the gap in coverage is less than three months, you may qualify for an exemption and not owe a payment. See question 22 for more information on the exemption for a short coverage gap.
22. What qualifies as a short coverage gap?
In general, a gap in coverage that lasts less than three months qualifies as a short coverage gap. If an individual has more than one short coverage gap during a year, the short coverage gap exemption only applies to the first gap.
so if I lose my insurance by end of this month and start my employers insurance in March I wont have to pay any fine right?