Only BD 3-4 says before O first month TTC

We got pregnant our second month TTC with our son, month we got pregnant we BD 3 days before, day of and day after pos OPK. This cycle we only BD Tue the 17th and got pos opk Thursday the 19th(so probably O'd the 20th) Nervous it won't be enough but still hopefully. We are going to try to BD again today. What do you ladies think?