Last month my period came on the 14 of December it last about a week heavier than normal usually it last for about 4-5 days. Now this month I haven't seen it as yet and I am scared I had sex after my period last month. I did a pregnancy test it showed negative. Please help me to find out why it haven't come yet

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I think one of the most common things is stress. If your extreamly nervous, and stressing out over not getting it, it will make it later. Wait 2-3 more weeks and take another pregnancy test.