Possibly pregnant

I've not had my period in almost a month. I've took pregnancies tests and they've all came back negative. Should I take another one after its been a month? I've got PCOS and my periods are regular anywhere between a year to two years. While I was on my fertlie window me and my boyfriend had sex every day. Sometimes twice a day. Is there a possibility that I am pregnant? I've been having cramps and I think that I'm gonna start but I don't. Thanks for yalls advice.