Why has your lawyer not filed for an emergency order for child support? This is a VERY easy fix and the fact that you have gone on for 4 months with no support order is confusing.
Initially when you file there should have been a temporary order for BOTH visitation and child support. If not, you need to find out from his lawyer what the issue is.
Actually - and I know you don't want to hear this..... If he's not been ordered to pay child support it's not really in his legal best interest to do yes (yes, it speaks to his character and him being a big turd...) but legally, if you guys haven't worked the state calculator and you're just pulling a figure out of your a$$..... then that sets a precedent. So, when you go to court if he's been paying $200/mo and you've been accepting it then when either one of you finds out he should have been paying more or less you can argue that you had a verbal agreement for that amount of money and there is no reason to adjust it.
So - get to court and get a temporary order. immediately.