I'm a little confused by the fact that your "Roommate gave notice." If your roommate said the two of you were going to terminate your lease, that notice could provide the basis for eviction.
The rest of the details seem a bit confusing, but generally without some form of notice you cannot be asked to leave, but during the first year of a month-to-month tenancy all that's required is 30-days written notice. Whether the notice given is sufficient or whether there's a retaliation claim or Fair Housing Act claim will depend on the specific facts, for which you should consult your own attorney. Familial status is a protected class under the Fair Housing Act, which may apply assuming this is not an owner-occupied structure.
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LL would need to have valid legal reasons to terminate your possession (i.e. your lease is expired, or you are on a month to month lease, or you breached in some way). LL has no power to summarily evict tenants. Only a court does.
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