Irregular Periods

I normally have regular periods in April I didn't have a period at all. In June I had one late in the month but in May I had one early in the month. Now I have tested twice last one was a week ago. And still a BFN. But if I didn't have a period in July. I'm wondering if I ovulated days later than what Glow says I did. If so can I be pregnant still and need to wait a little longer to test. My Husband and I have sex like every 2 or 3 days. I have 2 kids already so I know I'm fertile.