I already filed my taxes from my previous employer,I have not received a W2 from new employer I been there for six months

If you are not an actual employee, you would not get a w2. Are you getting paychecks showing Medicare and Social Security tax paid or are you being given a check or cash in full? Ask your employer if you are an employee or a contractor. If you are a contractor, you should get a form 1099-NEC if you earned over $600. See: 

• Independent contractor  vs employee 
• Am I considered self-employed?

If you are an employee,  talk to your employer. If you can't get one, you need to file a substitute w2 using paystubs and mail in your return. See How do I file a substitute W-2 using Form 4852?

The form 4852 is a last resort. This is what the form says:

 If you don’t receive the missing or corrected form from your employer or payer by the end of February, you may call the IRS at 800-829-1040 for assistance. You must provide your name, address (including ZIP code), phone number, social security number, and dates of employment. You must also provide your employer’s or payer’s name, address (including ZIP code), and phone number. The IRS will contact your employer or payer and request the missing form.

Because of this, you cannot e-file a return with a 4852, it must be mailed in.