okay so me and my boyfriend have had sex but he never finishes in me and our form of protection is birth control. so basically I'm on day 45 and I still haven't gotten my period, my periods are irregular last from 27-42 days with periods lasting 5-7 days. my period tracker told me I would miss my period in September and get it October 2-3, but instead I got it September 24th-30th. so my period was expected on October 27th, but I missed and then it switched to October 29th and missed again and had gone five days with nausea (which happened in July and I ended up getting my period about 9 days after those symptoms.) I haven't had any other symptoms aside from the five days of nausea so I really don't know what to do?