I really need advice for trigger

So this Is my first time doing a trigger shot with letzorole 5mg days 4-8 this month . Had taken letzorole and clomid before but lower dosages but no trigger . I went for ultrasound on Thursday and doc said I had 2 dominant ultrasounds left side at 13mm . Come back and Monday, well check again and hopefully they are around 18mm and we can trigger. I was so excited but I paid 300 just for the monitoring follicle ultrasound and another if I go this Monday plus $180 for the trigger . So I just took a opk and def postive, so question is should I just do it tomorrow in Hope's I dont ovulate before and spend that money with the trigger as a boost or dont waste it and just bd tonight ??? How successful are the trigger shots and would I be to late ??