Help me please DONT SKIP

I've been having spotting these last few days, the first day was really dark red blood, like it filled half my knickers, put on a liner and it turned into really really dark brown blood and quite a lot of it, then slowed right down to brown stringy mucus stuff and then it stopped for a day and was just yellowy discharge and now I'm having mucus with tinges of pink/red in it? I have 1 active pill left before my 7 day break and about 4 days before my withdrawal bleed. I had unprotected sex this month because the condom broke during what would have been my "ovulation" but obvs I'm on the pill so? And doc told me that you don't always necessarily stop ovulating, the pill stops implantation, anyway- what I'm having now looks like implantation and I'm really terrified, or is this just still spotting and breakthrough bleeding from the combined pill? Bearing in mind I've only been on it for 2 months and I take it religiously to the minute every day and I've never missed one but I'm so terrified about pregnancy. Someone PLEASE put my mind at ease :/