I may be over reacting but my husband and I had sex about 13 days ago and he came inside me. I've taken pregnancy tests and all have come out negative. I'm sure it's to early anyways. Does anyone know how soon you can miss a period after you conceive? He really wants kids but I'm just iffy about it. Would rather not be pregnant right now. My period was supposed to start 5 days ago. We had the sex 13 days ago.