I used to/have irregular periods. It's seemed to regulate out over the past couple months. In October it came on the 19th but in November it came on the 21st then in December it came on the 19th. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> predicted my period to come on the 19th but it hasn't come yet. I had protected sex on New Years. I took a pregnancy test yesterday & it came out negative. Should I test again? Is this normal? Please help ...