We already have 5 children already together and we have decided we would like just one more and have just started trying we had sex 3 nights in a row just after my last period.I am having cramps like period pains in my lower tummy along with a heavy feeling and i have low back ache it hurts more when walking or doing things and seems to feel better when sitting down and resting.i'm not due on my period for about 10 days yet so to early for a test.but was wondering i could be pregnant and this was an early sign.