My period ended like 3-4 days ago, the next two days after that me and my boyfriend had sex, didn't use protection and I'm not on birth control. I don't think I have the chance of getting pregnant but today I was spotting and then I felt super nauseous this morning and around 12. Also last night I was having some super harsh cramps right before I went to bed. I don't think I could get pregnant this soon but does this sound familiar?