so scared! please help girls

Right so I came off the pill a week ago today and I've not had a proper period! I've had some brown stuff and I had a bit of blood and today it seems like I have spotting but I'm not postive what it is! Me and my boyfriend had sex last week and we did use a condom but I'm still so scared😣what could it be?? Could my body just been getting use to the pill again since I got put back on it now long ago or could I be pregnant? I've had some period pains today but I have to take my pill again tonight which means I wouldn't of had a proper period this month and I've always had a proper period since I started my period at age 12 and I'm 16 now!! Please help girls it would be so much appreciated to give me advice or put my mind to rest