staying fit

Before I got pregnant I had just lost 60lb I was 170 and 120 when i found out I was 2 weeks with my baby boy. I want to go back to working out ASAP. I miss my body so much I have gotten so much stretch marks my eyes are extremely red that look like I've gotten beaten up that they are even pealing. Well I want some advice to start gaining some beauty back help some stretch marks go away help my skin and how soon I can go back to working out ! My boyfriend is a trainer witch will be perfect but I just want to know how soon I can hit the gym I deff miss it.