Please HELP!!

AF came on the 8th and ended a week ago today. Sunday I took an ovulation test and it came up positive. My husband and I are trying the every other day schedule with BD. On Monday I took a test it said negative, BD anyway and used PreSeed for the first time. Tuesday woke up and got a negative ov test and Tuesday night got a positive so he's a firefighter and didn't want to miss my chance so we used PreSeed and BD. Wednesday we skipped but I noticed I was spotting lightly and had light cramps. Last night we BD didn't use PreSeed because I'm worried that's what's making me cramp and spot, BD and the bleeding was heavier not like period heavy but the heaviest it's been since I began spotting. I called my Drs and have an apt. Monday but wanted to know if this has happened to anyone before. A friend suggested I could be pregnant but then would the ov test show up as positive?