Implantation bleeding? My situation.

So I know this question is posted many times, but I do need some advice. I'm currently traveling for work, which is why I want to wait to test until I'm home with my husband.  On Sunday we had Sex and I noticed some bleeding when we finished. It wasn't anything crazy and pretty normal. The bleeding was similar to a period. AF is due on the 17th. Every day since Sunday, I have very light bleeding only noticeable when I wipe. Thoughts? I would do a hpt, but I'm away on work.  I plan on it on Thursday!  I really hope it is implantation bleeding since we have been TTC since august.  Help ;)