On The 21/12/2015 Visited My Bf Was Spotting So We

On the 21/12/2015 visited my bf was spotting so we used a condom not sure if we used it correctly every time. 24th had a period and was heavy flow with terrible cramps. Immediately after my breast got sore and sensitive. The next week they were bigger to an extent that I had to buy new bras In January my period missed. Took pregnancy test and it was negative. 1 Feb had long period 3 march had period bt was short like 6 days. something moves in my stomach