help! advice! your thoughts!

Desiree
So I thought I'd get some advice from you girls.
We've been trying to conceive for about 1 year now. We do have a year old son and we were never trying with him so I'm not to sure how long it took with him. My last period was dec 6th? I was suppose to have my period Jan 3rd and Jan 31st as well instead I missed the 3rd and had spotting for 2days before the 31st. Took about 4 test all BFN!!!! :(
So I've waited to see maybe I'll get it this month  and still nothing what could be going on. Ive never missed a period and I had implantation bleeding with my DS. So could that spotting be IB?