Please help!

Ok so here's the deal. We have been trying for number two for about 2 months. In that two months I have been going on interviews for a new job. I landed an outstanding offer that is going to start out paying 25% more than my current salary! I'm in heaven right now about it. I haven't accepted the job yet. But I also just found out in 4 weeks pregnant. We were not expecting it to happen so soon. I have not told anyone I'm pregnant and my husband is super expired. This job is a life changer for sure. But I told my mom about the job offer and she dais I should wait to start a family now because I don't want to give them a reason to think I'm unreliable or to find a reason to fire me. It made me over emotional now and I'm scared that I'll take this job. They will find out in pregnant and they will be gunning for me. I know is illegal but still in in a manufacturing field. Not a lot of females. But I fell in love with the place during my interview and I felt a connection with all of them. They had me in a 7 panel interview.

Just wondering what you all think? Or if anyone has ever been in this situation?

Thank you for your help.