I was working for employer A whose H1B petition is valid until 2020 mid, I joined employer B and got laid off after 8 months. I planned to get back to employer A as his H1B is not yet revoked. However my 60 days grace period is almost ending and my employer A has filed for LCA just 2 days before the grace period expiry, can I still work for employer A or should I need to leave USA before the grace period? If employer A can run the pay stub before the grace period is that fine or should he need to send the petition for amendment or any to USCIS? please advice.