Period worry help

πŸ’ Trisha πŸ’ β€’ I have a 10 year old daughter Demi Leigh 20/08/05 Born 26wks prem weighed 1lb14 my miracle baby πŸ’–πŸšΌπŸΌπŸ’ I have a son keyen age 8 born 26/08/07 weighing 3lb 11 born @33weeks🚼. Trying baby no3 πŸšΌπŸΌπŸ’–
My AF was due 18/4/16 hasn't shown on Tuesday a pink spot wen wiped nothing since wiped yesterday a little bit me and partner had sex and I bleed wen he pulled out and know nothing again help I'm so confused I tested yesterday nothing my period's are never like this