Pregnant or just PMS?

I had 2 periods in Sep. about 2 weeks apart and then totally didn't get one in October. According to eve I'm 15 days late for my period due now in November. I have been super stressed lately and my anxiety has been through the roof. I had some cramping yesterday and my breasts are tender. Some acne in the hormonal areas. I'm thinking the stress has caused the hormonal imbalance but I'm afraid I may be pregnant. Help!