Why am i having this now?

Why am I having brownish discharge ? Cycle day 1 bled like normal period till later I stopped bleeding no spotting.

Cycle day 2 bled like a normal period.

Cycle day 3 bled like a normal period. Cycle day 4 I stopped bleeding and had spotting brown and pink. But later started bleeding again. Until later that night started spotting brown again.

Cycle day 5 Spotting brown ( not a lot).

Why is my cycle doing this? This never happened before ever. Why now we've been TTC so hopefully it can mean something good. Tia