Spotting?

Amanda • I`m 28 years old. Married since 2011. We have a 5 year old son. Baby #2 due in nov2016!
So my fertile week ended on the 1st, SO and I only managed to have sex the first 3 days..crazy busy. Been trying to pinpoint when I ovulate but it's been difficult. Anyway, yesterday and today I've had some very slight spotting..AF isn't until 2/11..confused. Oh and I had some weird cramping yesterday.