I had physical contact in November and December once. There was no deep penetration, only foreplay. I have been getting my periods regularly with 4-5 days early or late max. I did not get a period in March despite being pretty regular. It is 10 days late. I took a pregnancy strip test in evening which came negative. Recently my weight has increased and my face looks swollen too. I had throat infection and took heavy antibiotics and antiallergics. I also have watery discharge often. I have no other symptoms of pregnancy. Could I be pregnant?