trying to get pregnant, need advice

Sorry for the length but help a girl out? I don't see how I'm not pregnant. I haven't been taking the pill for almost 5 months now, and this month me and my boyfriend have been having sex on the daily.. and he's been cumming in me every time. I have the app called Flo (tracks period, low and high chances of being pregnant and your ovulation day) (just started using Glo 2 days ago so I'm new) well we had sex literally almost everyday this month and he came in me on the low, high and my ovulation day. Well a few days ago I was getting nauseous and it was in the mornings, I'd feel sick or my stomach just felt blah and my appetite went up , I would have dreams about being pregnant also. Well Wednesday (5 days before my next expected period) and Thursday (4days before my period) I was just too anxious to wait so I took 1 pTest those days and they came out negative.. how??