Late AF no sex for 2 weeks

On the 26 I will be 2 weeks late and haven't had sex in almost 2 weeks. Usually when I'm late and we have sex my period seems to just get "knocked outta me" I really want it though and my husband is finally feeling better. (Allergic reaction to poison ivy and than allergic reaction to meds he got) anybody else ever find that if you have sex your period seems to just show up?