Re-Taking Pills

Hello! I had birth control pills (Diane Pills) for 3 months, but stopped it this month because my boyfriend and I were in a Long Distance Relationship because of his work. However, he came back earlier than expected.

I want to take pills again, but I haven't had my menstruation yet (I started my first pill on my first period).

Can I still take it today even if I don't have my menstruation yet? Thanks!