Suggestions while TTC

So I'm thinking I'm out this month. AF due in 4 days, tested & negative. I know it's early but I don't feel pregnant. I'd like to do something different next month. I've been using opk's which is hard because they're ALWAYS dark but I was thinking about trying Pre Seed. I've read some good reviews on it so I'd like to try. Other than that I'm not sure how else I can change things up. Hubby & I make sure to have sex every other day and sometimes 2-3 days straight during fertile week. Praying for that BFP next time. Anyone have any suggestions on anything that might help or I can change up? Thanks.