Advice please

So about 4 months ago I had sex and I had to take the next morning pill the doctor told me it might not fully work because the time when I was ovulation well since then I’ve had my period as normal however last month my period was for about a day or two late which can be pretty normal I think but this month it’s late 6 days. I know I’m not pregnant (I also took pregnancy test as stupid as that sounds just to be sure) I’m pretty sure it also can’t be ectopic however in the last couple of weeks every know and then I get this very bad cramps that shoot down from my lower stomach to my vagina and my butt hole but the problem is the last time I had cramps was when I first got my period since then I haven’t I am lucky to say that I only get tender breast and I crave chocolate but this month nothing except the cramps and that’s it nothing else. Today I tried to call my doctor I spoke to the receptionist and she basically told me there’s nothing she can help me with I said about blood tests as this isn’t normal for me and she told me no we don’t do that your period is not that late and if it doesn’t come it’s fine when she told me that I found it a bit weird because I’m 22 and then she just told me to wait another week try and take a pregnancy test (which made no sense since I had sex 4 months ago ) and if I’m pregnant it will show however that’s all she had for me. Now I feel very anxious and her not actually listening to me is making it worse which can make it even more late even if it does but I’m not sure what could this mean am I just over reacting and should just wait it out or has this happened to someone else and it was something bad ?