Weird cramps.

So today is 3dpo and I am experiencing some weird crampy pains right in my lower pelvic area. They almost feel like gas pain but at the same time they feel kind of sharp and achey which is different from my usual gas pains. I don't think it can be pregnancy since the last time my husband and I BD was in September before he left for work over seas and I had my period twice since then. I was in my fertile period during the time of intercourse but I didn't miss my periods so wtf is going on!? Lol.