Confused

So let me start off with yes I’m sexually active and I use condoms. Now, last month my period was late by like a day. Before that every month was on time. This month it was 7 days late. Yesterday I went to the restroom and there was a pink streak. When I went again later there was nothing. So there was nothing the rest of the day. When I went to the bathroom today and wiped there was a light pink streak. Went again and same thing. Went a 3rd time and it got a little heavier but not really. So I placed a tampon in. When I removed the tampon there wasn’t very much on there. It kinda looked a bit brown in some spots. The way it does at the end of my period. So I’m very confused on what the heck is going this month. I mean I had back pains and cramps the way I always do. But I’m not stressing or anything. Any ideas?